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教案备课库《八年级数学平行线分线段成比例专题练习题》真题及答案
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如图所示为钓鱼竿钓鱼的示意图O为支点请在图中A点画出使钓鱼竿静止时的最小力F1及对应的力臂L1．
如图所示物体A和B所受重力都为100牛不考虑滑轮重力当用力分别匀速提起物体A和B时力FA为牛．若物体B被提高了2米则力FB做功焦．
一质量为2千克的铜块当它的温度升高100℃时铜块所吸收的热量是J．[铜的比热是0.39×103J/Kg•℃]．在召开第二届亚洲青年运动会时工作人员通过古老的钻木取火方式在几分钟内采火成功这个过程中能转化为内能．
画出图中对应的折射光线．
在探究杠杆平衡的条件的实验中1调节平衡螺母使杠杆在水平位置平衡目的是．2如图乙当杠杆在水平位置平衡时与图甲相比弹簧测力计示数将．3如图丙支架上的杠杆静止此时杠杆处于状态．直接挂上钩码进行实验则在实验当中应使杠杆在选填水平位置或图中位置平衡才能得出正确结论．
若m是三次多项式n是三次多项式则m+n一定是
Mr.Watsonisagoodteacher.Hehasagoodonhisstudents'behaviorandcharacter.
计算题-a-b2
Jerrybrokehisdad'snewglassesandhethetruth. A.daren'ttotell B.daren'ttell C.didn'tdaretell D.notdaretell
Atpresentpeoplecomputerswhichcaneveryday. A.areusedtousing;beusedtowork B.usedtousing;beusingtowork C.usedtouse;beusedtowork D.areusedtousing;beusedtoworking
MartinLutherKinggaveaIhaveadreamwhichwasaboutracism. A.speech B.speak C.joke D.show
计算题8-y2
Peterisvery.Healwaystellsusinterestingjokes.
Billyhasbeenabsencefromschoolfor3daysandweallworryabouthim.
如图所示闭合开关S发现电灯L1L2均不亮电流表示数为零说明电路存在故障若故障只出现在电灯上用电压表进行检测发现bc间电压为零ab和ac间电压均为3V则电路的故障是．
计算题
Herdadisanandhemanypeopleeveryyear. A.interview;interviewees B.interviewer;interviews C.interviewee;interviews D.interviewer;interviewees
Ididn'tknowtheytheterriblesituation. A.what;dowith B.how;didwith C.how;dealwith D.how;dealtwith
斜面上某物体在拉力F的作用下沿着斜面向上做匀速直线运动斜面足够长且不光滑此时拉力F与摩擦力f的大小关系是Ff选填“＞”“＜”或“=”．撤掉F几分钟后物体向下运动此时物体所受摩擦力和向上运动时所受摩擦力相比是的．选填“变大”“不变”或“变小”．
下列事实或现象属于光的反射的是
计算题a+62
某商品先按批发价a元提高10%零售后又按零售价降低10%出售则它最后的售价是
用简便方法计算103×103
AsLeaguemembersweshouldtakegreatprideeverythinggoodthatwedo.
Whomadeagoodof120pointsintheEnglishexam?—Bob. A.score B.point C.mark D.cent
Ourclassisthewinnerofthebasketballgame.Weareprideofoursuccess.
Daisyusedtobe silenceinclassbutsheistalkativeandoutgoingnow.
In1605ascientisttookawillowbranch柳枝andplantedit.Hedidn'tplantitinthegroundhowever.Heplanteditinavaseofsoil.Forthenextfiveyearsthescientistwateredthatwillowcarefully. Thewillowgrewandgrew.Wherediditgetthefoodforitsgrowth?Tomostpeoplethiswasaneasyquestion.Thewillowplantofcoursetookthefoodfromthesoil. Thescientisthoweverwantedevidence证据.Ifthewillowtookthefoodfromthesoilforitsgrowththenasitgrewandweighedmorethesoiloughttoweighless.Heweighedthewillowbranchbeforeheplantedit.Itweighedfivepounds.Thenheweighedthesoil.Itweighed200pounds.Afterfiveyearsheweighedtheplantandthesoilagain.Thewillowtreeweighed169poundsbutthesoilweighedalmostthesame. Theresultwassurprising.Wheredidthe164poundscomefrom? Aftermanyinvestigations调查thescientistgottheanswer.Hehadgivenwatertothewillowandthewillowgotitsfoodfromthewater. Hewasrightinaway.Todayweknowmoreaboutthequestion. 根据短文内容判断句子正T误F. 56.Thescientistdidtheexperimentinthesixteenthcentury. 57.Mostpeoplethoughttheplantgotthefoodfromthesoilforitsgrowth. 58.Thesoilinthevaseweighedtwohundredpounds. 59.Thescientistfoundthatthewillowgrewandweighedmoreandthesoilweighedless. 60.Nowweknowaboutthequestionasmuchasthescientistdid.
Themotherwasherchildren'ssuccess. A.proudof B.prouder C.pridein D.proudest
用简便方法计算．103×97
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