七年级下册数学几何复习题 2

七 年级 六年级体育公开课教案九年级家长会课件PPT下载六年级家长会PPT课件一年级上册汉语拼音练习题六年级上册道德与法治课件 下册数学几何复习题 2 9((2011?扬州)如图，C岛在A岛的北偏东60?方向，在B岛的北偏西45?方向，则从C岛看A、B两岛的视角?ACB,________. 答案 105? 解析 如图，?(60?，?CAB)，(45?，?ABC),180?，??CAB，?ABC,75?，在?ABC中，得?C,105?. 12(如图所示，在?ABC中，?A,80?，?B,30?，CD平分?ACB，DE?AC. (1)求?DEB的度数; (2)求?EDC的度数( 解 (1)在?ABC中，?A,80?，?B,30?， ??ACB,180?,?A,?B,70?. ?DE?AC， ??DEB,?ACB,70?. (2)?CD平分?ACB， 1??DCE,?ACB,35?. 2 ??DEB,?DCE，?EDC， ??EDC,70?,35?,35?. 13(已知，如图，?1,?2，CF?AB于F，DE?AB于E，求证:FG?BC.(请将 证明 住所证明下载场所使用证明下载诊断证明下载住所证明下载爱问住所证明下载爱问 补充完整) 证明 ?CF?AB，DE?AB(已知)， ?ED?FC( )( ??1,?BCF( )( 又??1,?2(已知)， ??2,?BCF(等量代换)， ?FG?BC( )( 解 在同一平面内，垂直于同一直线的两条直线互相平行;两直线平行，同位角相 should be tightened, no loose, Terminal Board wiring should be one on each side, no more than two. J, shielded wire, spare wire binding order, reliable grounding. 7.7 quality standard 7.7.l cables through the cable embedded tube making use of galvanized steel pipe, tube ends without burrs, smooth. 7.7.2 pipe does not allow bending, bending the bend radius should be ? 4 times times the outer diameter of the tube in. 7.7.3 ellipticity of a bent tube, pipe diameter ? 60mm, not >8%, diameter >760mm, not >6%. 7.7.4 making cables buried piping application root production, growing where interface is required, only straight pipe, only the wire port connections, welded connections are not allowed. 7.7.5 service sleeve should have a good grounding. 7.7.6 cable trays installation, burrs and dirt and corrosion treatment should be carried out, install the bridge ... 7.8.1.7 piping and piping, equipment and equipment or piping and other equipment shall have sufficient expansion gap in hot situations. 7.8.1.8 metal temperature of the insulating layer (hot) = shell-wall temperature of environment temperature ? 40 ? c. 7.8.2 paint 7.8.2.l paint of equipment and pipelines should have at least a primer (red paint) and finish. 7.8.2.2 paint appearance color uniform, without paint, rust, flaking, wrinkles, flow marks, scum, paint particles and visible brush marks. 7.8.2.3 interlayer should be tight and without stratification. 7.8.2.4 pipelines asphalt, fiber glass fabric corrosion, external appearance should never show surrounded by glass fiber cloth uniform, dense, painted pitch inspection should be no delamination, cavitation, homogeneity of asphalt coating, brushing each layer thickness in accordance with design requirements. Standard 7.9 7.9 structure placement process. 1 fair-faced concrete is a concrete surface without any decoration, structure appearance quality of concrete structure that is able to display strength and aesthetic perception of quality standards. Construction technology requirements are as follows: template template Panel selection and processing require plate high strength, good toughness and 等;内错角相等，两直线平行( 14(如图，已知三角形ABC，求证:?A，?B，?C,180?. 分析:通过画平行线，将?A、?B、?C作等角代换，使各角之和恰为一平角，依辅助 线不同而得多种证法，如下: 证法1:如图甲，延长BC到D，过C画CE?BA. ?BA?CE(作图所知)， ??B,?1，?A,?2(两直线平行，同位角、内错角相等)( 又??BCD,?BCA，?2，?1,180?(平角的定义)， ??A，?B，?ACB,180?(等量代换)( 如图乙，过BC上任一点F，画FH?AC，FG?AB，这种添加辅助线的方法能证明? A，?B，?C,180?吗,请你试一试( 解 ?FH?AC， ??BHF,?A，?1,?C. ?FG?AB， ??BHF,?2，?3,?B， ??2,?A. ??BFC,180?， ??1，?2，?3,180?， 即?A，?B，?C,180?. 15((2010?玉溪)平面内的两条直线有相交和平行两种位置关系( (1)如图a，若AB?CD，点P在AB、CD外部，则有?B,?BOD.又因?BOD是?POD 的外角，故?BOD,?BPD，?D，得?BPD,?B,?D.将点P移到AB、CD内部，如 图b，以上结论是否成立,若成立，说明理由;若不成立，则?BPD、?B、?D之 间有何数量关系,请证明你的结论; oughness andgood tuction technology requirements are as follows: template template Panel selection and processing require plate high strength, pearance quality of concrete structure that is able to display strength and aesthetic perception of quality standards. Constrfaced concrete is a concrete surface without any decoration, structure ap-nts. Standard 7.9 7.9 structure placement process. 1 fairo delamination, cavitation, homogeneity of asphalt coating, brushing each layer thickness in accordance with design requiremebe n rosion, external appearance should never show surrounded by glass fiber cloth uniform, dense, painted pitch inspection shouldbrush marks. 7.8.2.3 interlayer should be tight and without stratification. 7.8.2.4 pipelines asphalt, fiber glass fabric cor isiblenish. 7.8.2.2 paint appearance color uniform, without paint, rust, flaking, wrinkles, flow marks, scum, paint particles and vt temperature ? 40 ? c. 7.8.2 paint 7.8.2.l paint of equipment and pipelines should have at least a primer (red paint) and fiwall temperature of environmen-ent expansion gap in hot situations. 7.8.1.8 metal temperature of the insulating layer (hot) = shellt, install the bridge ... 7.8.1.7 piping and piping, equipment and equipment or piping and other equipment shall have sufficiied ouce sleeve should have a good grounding. 7.7.6 cable trays installation, burrs and dirt and corrosion treatment should be carrre interface is required, only straight pipe, only the wire port connections, welded connections are not allowed. 7.7.5 serving whepipe diameter ? 60mm, not >8%, diameter >760mm, not >6%. 7.7.4 making cables buried piping application root production, growiding, bending the bend radius should be ? 4 times times the outer diameter of the tube in. 7.7.3 ellipticity of a bent tube, ow benthrough the cable embedded tube making use of galvanized steel pipe, tube ends without burrs, smooth. 7.7.2 pipe does not allch side, no more than two. J, shielded wire, spare wire binding order, reliable grounding. 7.7 quality standard 7.7.l cables should be tightened, no loose, Terminal Board wiring should be one on ea2 (2)在图b中，将直线AB绕点B逆时针方向旋转一定角度交直线CD于点Q，如图c， 则?BPD、?B、?D、?BQD之间有何数量关系,(不需证明) (3)根据(2)的结论求图d中?A，?B，?C，?D，?E，?F的度数( 解 (1)不成立，结论是?BPD,?B，?D. 延长BP交CD于点E， ?AB?CD，??B,?BED. 又?BPD,?BED，?D， ??BPD,?B，?D. (2)结论:?BPD,?BQD，?B，?D. (3)设AC与BF交于点G. 由(2)的结论得:?AGB,?A，?B，?E. ,?，?，?，?，?,360?，??，?，?，?又??AGBCGFCGFCDFABC D，?E，?F,360?. A D14(把一副常用的三角板如图所示拼在一起，那么图中?ADE是 度( E CB 第14题 2(如图，在?ABC和?ABD中，现给出如下三个论断:?AD,BC;??C,?D;??1,?2。 请选择其中两个论断为条件，一个论断为结论，另外构造一个命题( ?,,?(1)写出所有的正确命题(写成“ ”形式，用序号表示):( ,?, ,,(2)请选择一个正确的命题加以说明(你选择的正确命题是: , , 说明: 3(如图，直线AD和BC相交于O，AB?CD，?AOC,95?，?B,50?，求?A和?D. -. 7.8.1.8 metal temperature of the insulating layer (hot) = shellations.1.7 piping and piping, equipment and equipment or piping and other equipment shall have sufficient expansion gap in hot situing. 7.7.6 cable trays installation, burrs and dirt and corrosion treatment should be carried out, install the bridge ... 7.8groundy straight pipe, only the wire port connections, welded connections are not allowed. 7.7.5 service sleeve should have a good eter >760mm, not >6%. 7.7.4 making cables buried piping application root production, growing where interface is required, onldiam should be ? 4 times times the outer diameter of the tube in. 7.7.3 ellipticity of a bent tube, pipe diameter ? 60mm, not >8%, ing use of galvanized steel pipe, tube ends without burrs, smooth. 7.7.2 pipe does not allow bending, bending the bend radiusre binding order, reliable grounding. 7.7 quality standard 7.7.l cables through the cable embedded tube makshould be tightened, no loose, Terminal Board wiring should be one on each side, no more than two. J, shielded wire, spare wias follows: template template Panel selection and processing require plate high strength, good toughness andto display strength and aesthetic perception of quality standards. Construction technology requirements are faced concrete is a concrete surface without any decoration, structure appearance quality of concrete structure that is able -cement process. 1 faire plamogeneity of asphalt coating, brushing each layer thickness in accordance with design requirements. Standard 7.9 7.9 structurnever show surrounded by glass fiber cloth uniform, dense, painted pitch inspection should be no delamination, cavitation, ho shouldyer should be tight and without stratification. 7.8.2.4 pipelines asphalt, fiber glass fabric corrosion, external appearance r uniform, without paint, rust, flaking, wrinkles, flow marks, scum, paint particles and visible brush marks. 7.8.2.3 interlast a primer (red paint) and finish. 7.8.2.2 paint appearance colowall temperature of environment temperature ? 40 ? c. 7.8.2 paint 7.8.2.l paint of equipment and pipelines should have at lea3 4(如图，?中，角平分线、、相交于点，过点作?，垂足为，那么ABCADBECFHHHGABG?AHE,?CHG吗,为什么, 5(如图17，在?ABC中，AD为?BAC的平分线，DE?AB于E，DF?AC于F，?ABC面积 2是28cm，AB=20厘米，AC=8厘米，求DE的长( 第5题 6(如图，已知AB?CD，垂足为B，AB=DB，AC=DE(请你判断?D与?A的关系，并说明理 由( A E CBD 第6题 7(如图，AD=BC，DC=AB，AE=CF，找出图中的一对全等三角形，并说明你的理由( DC F E BA brush marks. 7.8.2.3 interlayer should be tight and without stratification. 7.8.2.4 pipelines asphalt, fiber glass fabric cor isiblenish. 7.8.2.2 paint appearance color uniform, without paint, rust, flaking, wrinkles, flow marks, scum, paint particles and vt temperature ? 40 ? c. 7.8.2 paint 7.8.2.l paint of equipment and pipelines should have at least a primer (red paint) and fiwall temperature of environmen-ent expansion gap in hot situations. 7.8.1.8 metal temperature of the insulating layer (hot) = shellt, install the bridge ... 7.8.1.7 piping and piping, equipment and equipment or piping and other equipment shall have sufficiied ouce sleeve should have a good grounding. 7.7.6 cable trays installation, burrs and dirt and corrosion treatment should be carrre interface is required, only straight pipe, only the wire port connections, welded connections are not allowed. 7.7.5 serving whepipe diameter ? 60mm, not >8%, diameter >760mm, not >6%. 7.7.4 making cables buried piping application root production, growiding, bending the bend radius should be ? 4 times times the outer diameter of the tube in. 7.7.3 ellipticity of a bent tube, ow benthrough the cable embedded tube making use of galvanized steel pipe, tube ends without burrs, smooth. 7.7.2 pipe does not allch side, no more than two. J, shielded wire, spare wire binding order, reliable grounding. 7.7 quality standard 7.7.l cables should be tightened, no loose, Terminal Board wiring should be one on eaoughness andgood tuction technology requirements are as follows: template template Panel selection and processing require plate high strength, pearance quality of concrete structure that is able to display strength and aesthetic perception of quality standards. Constrfaced concrete is a concrete surface without any decoration, structure ap-nts. Standard 7.9 7.9 structure placement process. 1 fairo delamination, cavitation, homogeneity of asphalt coating, brushing each layer thickness in accordance with design requiremebe n rosion, external appearance should never show surrounded by glass fiber cloth uniform, dense, painted pitch inspection should4 第7题 8(如图，已知M在AB上，BC=BD，MC=MD(请说明:AC=AD( C M BA 第8题 D 9(如图， 在?ABC中，AB=AC，AC边上中线BD把?ABC的周长分为21厘米 12厘米两部分，求?ABC各边的长. A D B C 10(已知AE?BD，CF?BD，且AD=BC，BE=DF，试判断AD和BC的位置关系.说明你的结论( 11(如图，?ACB=?BDA=90?，AD=BC，AB//CD(试说明:?1=?2( 12(如图,，AC?BD，AC=DC，CB=CE，试说明:DE?AB( 13(如图，已知AB//DE，AB=DE，BE=CF，试说明?ABC??DEF的理由. 小明的说理过程如下: 因为AB//DE，所以?1=?2， 在?ABC和?DEF中 因为BE=CF，?1=?2，AB=DE，所以?ABC??DEF(SAS). mogeneity of asphalt coating, brushing each layer thickness in accordance with design requirements. Standard 7.9 7.9 structurnever show surrounded by glass fiber cloth uniform, dense, painted pitch inspection should be no delamination, cavitation, ho shouldyer should be tight and without stratification. 7.8.2.4 pipelines asphalt, fiber glass fabric corrosion, external appearance r uniform, without paint, rust, flaking, wrinkles, flow marks, scum, paint particles and visible brush marks. 7.8.2.3 interlast a primer (red paint) and finish. 7.8.2.2 paint appearance colowall temperature of environment temperature ? 40 ? c. 7.8.2 paint 7.8.2.l paint of equipment and pipelines should have at lea-. 7.8.1.8 metal temperature of the insulating layer (hot) = shellations.1.7 piping and piping, equipment and equipment or piping and other equipment shall have sufficient expansion gap in hot situing. 7.7.6 cable trays installation, burrs and dirt and corrosion treatment should be carried out, install the bridge ... 7.8groundy straight pipe, only the wire port connections, welded connections are not allowed. 7.7.5 service sleeve should have a good eter >760mm, not >6%. 7.7.4 making cables buried piping application root production, growing where interface is required, onldiam should be ? 4 times times the outer diameter of the tube in. 7.7.3 ellipticity of a bent tube, pipe diameter ? 60mm, not >8%, ing use of galvanized steel pipe, tube ends without burrs, smooth. 7.7.2 pipe does not allow bending, bending the bend radiusre binding order, reliable grounding. 7.7 quality standard 7.7.l cables through the cable embedded tube makshould be tightened, no loose, Terminal Board wiring should be one on each side, no more than two. J, shielded wire, spare wias follows: template template Panel selection and processing require plate high strength, good toughness andto display strength and aesthetic perception of quality standards. Construction technology requirements are faced concrete is a concrete surface without any decoration, structure appearance quality of concrete structure that is able -cement process. 1 faire pla5 小明的说理正确吗,若不正确，请你指出错误，帮助小明走出说理误区. 14(如图2，AC与BD相交于点E，AD=BC，?D=?C，试说明AC与BD全等的理由. 小华的说理过程如下: 在?ABD和?BAC中， 因为AD=BC，AB=BA，?C=?D， 所以?ABD??BAC(SSA) 所以AC=BD. 3((10分)如图15，在?ABC中，点D在AB上，BD=BE， (1)请你再添加一个条件，使得?BEA??BDC， 并说明理由，你添加的条件是 理由是: (2)根据你添加的条件，再写出图中的一对全等三角形 (只要求写出一对全等三角形，不再添加其它线段，不再标注或使用其它字母，不必说明理由)( 4((10分)已知:如图16，Rt?ABC?Rt?ADE，?ABC, ?ADE,90?，试以图中标有的字母的点为端点，连接两条线 段，如图你所连接的两条线段满足相等、垂直或平行关系中的 一种，那么请你把它写出来并证明( 1. 现有两根棍子长分别为3厘米，5厘米，若要选第三根棍子，使其与前两根拼成一个三角形，则它的长可为( ) A.1厘米 B.2厘米 C.5厘米 D.10厘米 rosion, external appearance should never show surrounded by glass fiber cloth uniform, dense, painted pitch inspection shouldbrush marks. 7.8.2.3 interlayer should be tight and without stratification. 7.8.2.4 pipelines asphalt, fiber glass fabric cor isiblenish. 7.8.2.2 paint appearance color uniform, without paint, rust, flaking, wrinkles, flow marks, scum, paint particles and vt temperature ? 40 ? c. 7.8.2 paint 7.8.2.l paint of equipment and pipelines should have at least a primer (red paint) and fiwall temperature of environmen-ent expansion gap in hot situations. 7.8.1.8 metal temperature of the insulating layer (hot) = shellt, install the bridge ... 7.8.1.7 piping and piping, equipment and equipment or piping and other equipment shall have sufficiied ouce sleeve should have a good grounding. 7.7.6 cable trays installation, burrs and dirt and corrosion treatment should be carrre interface is required, only straight pipe, only the wire port connections, welded connections are not allowed. 7.7.5 serving whepipe diameter ? 60mm, not >8%, diameter >760mm, not >6%. 7.7.4 making cables buried piping application root production, growiding, bending the bend radius should be ? 4 times times the outer diameter of the tube in. 7.7.3 ellipticity of a bent tube, ow benthrough the cable embedded tube making use of galvanized steel pipe, tube ends without burrs, smooth. 7.7.2 pipe does not allch side, no more than two. J, shielded wire, spare wire binding order, reliable grounding. 7.7 quality standard 7.7.l cables should be tightened, no loose, Terminal Board wiring should be one on eaoughness andgood tuction technology requirements are as follows: template template Panel selection and processing require plate high strength, pearance quality of concrete structure that is able to display strength and aesthetic perception of quality standards. Constrfaced concrete is a concrete surface without any decoration, structure ap-nts. Standard 7.9 7.9 structure placement process. 1 fairo delamination, cavitation, homogeneity of asphalt coating, brushing each layer thickness in accordance with design requiremebe n6 A B E D C 图1 图2 2.如图1所示，AD是?ABC的高，延长BC至E，使CE,BC，?ABC的面积为S，?ACE1的面积为S，那么( ) 2 A.S,SB.S,S C.S,S D.不能确定 12 1212 ,(三角形的三边长分别为5，，8，则的取值范围是_ ( xx 3.(10分)如图16，?ABC中，角平分线AD、BE、CF相交于点H，过H点作HG?AB，垂足为G，那么?AHE,?CHG吗,为什么, C F D H A B E G 图16 图17 4. (10分)如图17，在?ABC中，AD为?BAC的平分线，DE?AB于E，DF?AC于F， 228cm?ABC面积是，AB=20厘米，AC=8厘米，求DE的长( 四、拓广探索～(本大题共22分) 1((10分)如图18，在?ABC中，点D在AB上，BD=BE， (1)请你再添加一个条件，使得?BEA??BDC， 并说明理由，你添加的条件是 理由是: (2)根据你添加的条件，再写出图中的一对全等三角形 (只要求写出一对全等三角形，不再添加其它线段，不再标注或使用其它字母，不必说明理由。) as follows: template template Panel selection and processing require plate high strength, good toughness andto display strength and aesthetic perception of quality standards. Construction technology requirements are faced concrete is a concrete surface without any decoration, structure appearance quality of concrete structure that is able -cement process. 1 faire plamogeneity of asphalt coating, brushing each layer thickness in accordance with design requirements. Standard 7.9 7.9 structurnever show surrounded by glass fiber cloth uniform, dense, painted pitch inspection should be no delamination, cavitation, ho shouldyer should be tight and without stratification. 7.8.2.4 pipelines asphalt, fiber glass fabric corrosion, external appearance r uniform, without paint, rust, flaking, wrinkles, flow marks, scum, paint particles and visible brush marks. 7.8.2.3 interlast a primer (red paint) and finish. 7.8.2.2 paint appearance colowall temperature of environment temperature ? 40 ? c. 7.8.2 paint 7.8.2.l paint of equipment and pipelines should have at lea-. 7.8.1.8 metal temperature of the insulating layer (hot) = shellations.1.7 piping and piping, equipment and equipment or piping and other equipment shall have sufficient expansion gap in hot situing. 7.7.6 cable trays installation, burrs and dirt and corrosion treatment should be carried out, install the bridge ... 7.8groundy straight pipe, only the wire port connections, welded connections are not allowed. 7.7.5 service sleeve should have a good eter >760mm, not >6%. 7.7.4 making cables buried piping application root production, growing where interface is required, onldiam should be ? 4 times times the outer diameter of the tube in. 7.7.3 ellipticity of a bent tube, pipe diameter ? 60mm, not >8%, ing use of galvanized steel pipe, tube ends without burrs, smooth. 7.7.2 pipe does not allow bending, bending the bend radiusre binding order, reliable grounding. 7.7 quality standard 7.7.l cables through the cable embedded tube makshould be tightened, no loose, Terminal Board wiring should be one on each side, no more than two. J, shielded wire, spare wi7 2((12分)(1)如图19?，有一块直角三角板XYZ放置在?ABC上，恰好三角板XYZ的两条直角边XY、XZ分别经过点B、C.?ABC中，?A,30?，则?ABC+?ACB,______，?XBC+?XCB,______. (2)如图19?，改变直角三角板XYZ的位置，使三角板XYZ的两条直角边XY、XZ•仍然分别经过B、C，那么?ABX+?ACX的大小是否变化,若变化，请举例说明;若不变化，请求出?ABX+?ACX的大小. ? ? 三、解答题 21，先画两条已知线段a和b(a,b)，然后再画出线段AB,a,b. 122，如图，已知AE?BD，?1,3?2，?2,28?.求?C. 2 (图22) 23，如图，已知l?m，求?x，?y的度数. rosion, external appearance should never show surrounded by glass fiber cloth uniform, dense, painted pitch inspection shouldbrush marks. 7.8.2.3 interlayer should be tight and without stratification. 7.8.2.4 pipelines asphalt, fiber glass fabric cor isiblenish. 7.8.2.2 paint appearance color uniform, without paint, rust, flaking, wrinkles, flow marks, scum, paint particles and vt temperature ? 40 ? c. 7.8.2 paint 7.8.2.l paint of equipment and pipelines should have at least a primer (red paint) and fiwall temperature of environmen-ent expansion gap in hot situations. 7.8.1.8 metal temperature of the insulating layer (hot) = shellt, install the bridge ... 7.8.1.7 piping and piping, equipment and equipment or piping and other equipment shall have sufficiied ouce sleeve should have a good grounding. 7.7.6 cable trays installation, burrs and dirt and corrosion treatment should be carrre interface is required, only straight pipe, only the wire port connections, welded connections are not allowed. 7.7.5 serving whepipe diameter ? 60mm, not >8%, diameter >760mm, not >6%. 7.7.4 making cables buried piping application root production, growiding, bending the bend radius should be ? 4 times times the outer diameter of the tube in. 7.7.3 ellipticity of a bent tube, ow benthrough the cable embedded tube making use of galvanized steel pipe, tube ends without burrs, smooth. 7.7.2 pipe does not allch side, no more than two. J, shielded wire, spare wire binding order, reliable grounding. 7.7 quality standard 7.7.l cables should be tightened, no loose, Terminal Board wiring should be one on eaoughness andgood tuction technology requirements are as follows: template template Panel selection and processing require plate high strength, pearance quality of concrete structure that is able to display strength and aesthetic perception of quality standards. Constrfaced concrete is a concrete surface without any decoration, structure ap-nts. Standard 7.9 7.9 structure placement process. 1 fairo delamination, cavitation, homogeneity of asphalt coating, brushing each layer thickness in accordance with design requiremebe n8 24，如图，直线l，l，分别和直线l，l，相交，?1与?3互余，?2与?3的余角1234 互补，?4,115?.求?3的度数. 25，如图，已知?C,?D，DB?EC.AC与DF平行吗,试说明你的理由. (图25) 26，如图，AB、AE是两条射线，?2+?3+?4,?1+?2+?5,180?，求?1+?2+?3的度数. 27，如图，已知DB?FG?EC，?ABD,60?，?ACE,60?，AP是?BAC的平分线.求?PAG的度数. 28，如图，CD?AB，?DCB,70?，?CBF,20?，?EFB,130?，问直线EF与AB有怎样的位置关系，为什么, C D E F A B r uniform, without paint, rust, flaking, wrinkles, flow marks, scum, paint particles and visible brush marks. 7.8.2.3 interlast a primer (red paint) and finish. 7.8.2.2 paint appearance colowall temperature of environment temperature ? 40 ? c. 7.8.2 paint 7.8.2.l paint of equipment and pipelines should have at lea-. 7.8.1.8 metal temperature of the insulating layer (hot) = shellations.1.7 piping and piping, equipment and equipment or piping and other equipment shall have sufficient expansion gap in hot situing. 7.7.6 cable trays installation, burrs and dirt and corrosion treatment should be carried out, install the bridge ... 7.8groundy straight pipe, only the wire port connections, welded connections are not allowed. 7.7.5 service sleeve should have a good eter >760mm, not >6%. 7.7.4 making cables buried piping application root production, growing where interface is required, onldiam should be ? 4 times times the outer diameter of the tube in. 7.7.3 ellipticity of a bent tube, pipe diameter ? 60mm, not >8%, ing use of galvanized steel pipe, tube ends without burrs, smooth. 7.7.2 pipe does not allow bending, bending the bend radiusre binding order, reliable grounding. 7.7 quality standard 7.7.l cables through the cable embedded tube makshould be tightened, no loose, Terminal Board wiring should be one on each side, no more than two. J, shielded wire, spare wias follows: template template Panel selection and processing require plate high strength, good toughness andto display strength and aesthetic perception of quality standards. Construction technology requirements are faced concrete is a concrete surface without any decoration, structure appearance quality of concrete structure that is able -cement process. 1 faire plamogeneity of asphalt coating, brushing each layer thickness in accordance with design requirements. Standard 7.9 7.9 structurnever show surrounded by glass fiber cloth uniform, dense, painted pitch inspection should be no delamination, cavitation, ho shouldyer should be tight and without stratification. 7.8.2.4 pipelines asphalt, fiber glass fabric corrosion, external appearance 9 29，如图，已知:AB?BF，CD?BF，?BAF,?AFE.试说明?DCE+?E,180?的理由. 7、如图，AB?CD，直线EF分别交AB、CD于点E、F，ED平分?BEF，若?1=72?，则?2=___________. 8、如图，DE?BC，?DBE=40?，?EBC=25?，则?BED=___________度，?BDE=___________度. 9、已知，如图，?1=?2，AB?CD，?A=105?，?ABD=35?，则?BDE=___________度，?ABC=___________度. 10、如图，AB?CD，且?1=42?，AE?EC于E，则?2=__________度. 三、认真答一答(每小题10分，共60分) 1、如图所示的长方形台球桌面上，如果?1=?2=30?，那么?3等于多少度,?1与?3有什么关系, -nts. Standard 7.9 7.9 structure placement process. 1 fairo delamination, cavitation, homogeneity of asphalt coating, brushing each layer thickness in accordance with design requiremebe n rosion, external appearance should never show surrounded by glass fiber cloth uniform, dense, painted pitch inspection shouldbrush marks. 7.8.2.3 interlayer should be tight and without stratification. 7.8.2.4 pipelines asphalt, fiber glass fabric cor isiblenish. 7.8.2.2 paint appearance color uniform, without paint, rust, flaking, wrinkles, flow marks, scum, paint particles and vt temperature ? 40 ? c. 7.8.2 paint 7.8.2.l paint of equipment and pipelines should have at least a primer (red paint) and fiwall temperature of environmen-ent expansion gap in hot situations. 7.8.1.8 metal temperature of the insulating layer (hot) = shellt, install the bridge ... 7.8.1.7 piping and piping, equipment and equipment or piping and other equipment shall have sufficiied ouce sleeve should have a good grounding. 7.7.6 cable trays installation, burrs and dirt and corrosion treatment should be carrre interface is required, only straight pipe, only the wire port connections, welded connections are not allowed. 7.7.5 serving whepipe diameter ? 60mm, not >8%, diameter >760mm, not >6%. 7.7.4 making cables buried piping application root production, growiding, bending the bend radius should be ? 4 times times the outer diameter of the tube in. 7.7.3 ellipticity of a bent tube, ow benthrough the cable embedded tube making use of galvanized steel pipe, tube ends without burrs, smooth. 7.7.2 pipe does not allch side, no more than two. J, shielded wire, spare wire binding order, reliable grounding. 7.7 quality standard 7.7.l cables should be tightened, no loose, Terminal Board wiring should be one on eaoughness andgood tuction technology requirements are as follows: template template Panel selection and processing require plate high strength, pearance quality of concrete structure that is able to display strength and aesthetic perception of quality standards. Constrfaced concrete is a concrete surface without any decoration, structure ap10 2、给下列证明过程写理由. 已知:如图， AB?BC于B，CD?BC于C，?1=?2，求证:BE?CF. 证明:? AB?BC于B，CO?BC于C( ) ??1，?3=90?，?2，?4=90?( ) ??1与?3互余，?2与?4互余( ) 又??1=?2( ) ， ) ?__________=___________( ?BE?CF( ) . 3、如图，已知AF平分?BAC，DE平分?BDF，且?1=?2. (1)能判定DF?AC吗,为什么, (2)能判定DE?AF吗,为什么, 4、如图，已知AB?CD，AD?BC，求证:?A=?C，?B=?D. cement process. 1 faire plamogeneity of asphalt coating, brushing each layer thickness in accordance with design requirements. Standard 7.9 7.9 structurnever show surrounded by glass fiber cloth uniform, dense, painted pitch inspection should be no delamination, cavitation, ho shouldyer should be tight and without stratification. 7.8.2.4 pipelines asphalt, fiber glass fabric corrosion, external appearance r uniform, without paint, rust, flaking, wrinkles, flow marks, scum, paint particles and visible brush marks. 7.8.2.3 interlast a primer (red paint) and finish. 7.8.2.2 paint appearance colowall temperature of environment temperature ? 40 ? c. 7.8.2 paint 7.8.2.l paint of equipment and pipelines should have at lea-. 7.8.1.8 metal temperature of the insulating layer (hot) = shellations.1.7 piping and piping, equipment and equipment or piping and other equipment shall have sufficient expansion gap in hot situing. 7.7.6 cable trays installation, burrs and dirt and corrosion treatment should be carried out, install the bridge ... 7.8groundy straight pipe, only the wire port connections, welded connections are not allowed. 7.7.5 service sleeve should have a good eter >760mm, not >6%. 7.7.4 making cables buried piping application root production, growing where interface is required, onldiam should be ? 4 times times the outer diameter of the tube in. 7.7.3 ellipticity of a bent tube, pipe diameter ? 60mm, not >8%, ing use of galvanized steel pipe, tube ends without burrs, smooth. 7.7.2 pipe does not allow bending, bending the bend radiusre binding order, reliable grounding. 7.7 quality standard 7.7.l cables through the cable embedded tube makshould be tightened, no loose, Terminal Board wiring should be one on each side, no more than two. J, shielded wire, spare wias follows: template template Panel selection and processing require plate high strength, good toughness andto display strength and aesthetic perception of quality standards. Construction technology requirements are faced concrete is a concrete surface without any decoration, structure appearance quality of concrete structure that is able -11 5、如图，已知AB?CD，?1=?2，求证:?BEF=?EFC. 6、已知?α、?β，用尺规作一个角，使它等于2?α,?β. 答案: 三、1(?3=60?，?1与?3互余. 2(已知 垂直定义 互余定义 等角的补角相等 ?3 ?4 内错角相等，两直线平行 3((1)能判定DF?AC，可以证明，?BDF=?BAC，则由同位角相等，两直线平行来判定. (2)能判定DE?AF，可证?1=?BAF，则同位角相等，两直线平行. ,(AB?CD，? ?B，?C=180?，?A，?D=180? 又 AD?BC ? ?A，?B=180?，?C，?D=180? ? ?B=?D，?A=?C o delamination, cavitation, homogeneity of asphalt coating, brushing each layer thickness in accordance with design requiremebe n rosion, external appearance should never show surrounded by glass fiber cloth uniform, dense, painted pitch inspection shouldbrush marks. 7.8.2.3 interlayer should be tight and without stratification. 7.8.2.4 pipelines asphalt, fiber glass fabric cor isiblenish. 7.8.2.2 paint appearance color uniform, without paint, rust, flaking, wrinkles, flow marks, scum, paint particles and vt temperature ? 40 ? c. 7.8.2 paint 7.8.2.l paint of equipment and pipelines should have at least a primer (red paint) and fiwall temperature of environmen-ent expansion gap in hot situations. 7.8.1.8 metal temperature of the insulating layer (hot) = shellt, install the bridge ... 7.8.1.7 piping and piping, equipment and equipment or piping and other equipment shall have sufficiied ouce sleeve should have a good grounding. 7.7.6 cable trays installation, burrs and dirt and corrosion treatment should be carrre interface is required, only straight pipe, only the wire port connections, welded connections are not allowed. 7.7.5 serving whepipe diameter ? 60mm, not >8%, diameter >760mm, not >6%. 7.7.4 making cables buried piping application root production, growiding, bending the bend radius should be ? 4 times times the outer diameter of the tube in. 7.7.3 ellipticity of a bent tube, ow benthrough the cable embedded tube making use of galvanized steel pipe, tube ends without burrs, smooth. 7.7.2 pipe does not allch side, no more than two. J, shielded wire, spare wire binding order, reliable grounding. 7.7 quality standard 7.7.l cables should be tightened, no loose, Terminal Board wiring should be one on eaoughness andgood tuction technology requirements are as follows: template template Panel selection and processing require plate high strength, pearance quality of concrete structure that is able to display strength and aesthetic perception of quality standards. Constrfaced concrete is a concrete surface without any decoration, structure ap-nts. Standard 7.9 7.9 structure placement process. 1 fair12 -. 7.8.1.8 metal temperature of the insulating layer (hot) = shellations.1.7 piping and piping, equipment and equipment or piping and other equipment shall have sufficient expansion gap in hot situing. 7.7.6 cable trays installation, burrs and dirt and corrosion treatment should be carried out, install the bridge ... 7.8groundy straight pipe, only the wire port connections, welded connections are not allowed. 7.7.5 service sleeve should have a good eter >760mm, not >6%. 7.7.4 making cables buried piping application root production, growing where interface is required, onldiam should be ? 4 times times the outer diameter of the tube in. 7.7.3 ellipticity of a bent tube, pipe diameter ? 60mm, not >8%, ing use of galvanized steel pipe, tube ends without burrs, smooth. 7.7.2 pipe does not allow bending, bending the bend radiusre binding order, reliable grounding. 7.7 quality standard 7.7.l cables through the cable embedded tube makshould be tightened, no loose, Terminal Board wiring should be one on each side, no more than two. J, shielded wire, spare wias follows: template template Panel selection and processing require plate high strength, good toughness andto display strength and aesthetic perception of quality standards. Construction technology requirements are faced concrete is a concrete surface without any decoration, structure appearance quality of concrete structure that is able -cement process. 1 faire plamogeneity of asphalt coating, brushing each layer thickness in accordance with design requirements. Standard 7.9 7.9 structurnever show surrounded by glass fiber cloth uniform, dense, painted pitch inspection should be no delamination, cavitation, ho shouldyer should be tight and without stratification. 7.8.2.4 pipelines asphalt, fiber glass fabric corrosion, external appearance r uniform, without paint, rust, flaking, wrinkles, flow marks, scum, paint particles and visible brush marks. 7.8.2.3 interlast a primer (red paint) and finish. 7.8.2.2 paint appearance colowall temperature of environment temperature ? 40 ? c. 7.8.2 paint 7.8.2.l paint of equipment and pipelines should have at lea13