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舞蹈训练室竖直墙壁上安装有平面镜，甲、乙、丙三位同学在平面镜前的位置如图所示，他们位置连线是等腰直角三角形，甲在直角顶点，乙、丙连线平行于平面镜．则（ ） A．甲与甲的像间的距离小于乙与乙的像...
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如图所示一块平面镜置于O处恰能使光线AO被平面镜反射后照亮墙壁上的B点试用作图的方法确定平面镜的位
如图所示在正方形不透光的盒子中央有一个发白光的点光源S.盒子两边装有甲乙两块可绕O1O2点转动的平面
B.C.三点各开一个小孔并分别用红、绿、蓝滤色片盖住小孔。要使从A.
C.三个小孔射出的光线都汇聚在M.点。则两平面镜的转动情况及三束光在M.点汇聚后的颜色分别是 （ ） A.甲平面镜顺时针转动，乙平面镜顺时针转动，黑色 B.甲平面镜逆时针转动，乙平面镜逆时针转动，黑色
甲平面镜顺时针转动，乙平面镜逆时针转动，白色
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小宇是个健身爱好者经常在自己的房间里练哑铃他在正前方的墙壁上安装了平面镜a可以在训练过程中看到身体正
如图所示暗室中A.点放一支燃烧的蜡烛墙壁上有一面平面镜MN室中甲乙丙丁四个同学中能通过平面镜看到烛焰
如图所示蓄水池右侧竖直的墙壁上有一平面镜平面镜前有一发光点B潜水员在水中A点看到B点在平面镜中的像
如图所示是艺术体操训练房的俯视图训练房的北墙有一大平面镜当老师从室外进入到图示位置时甲乙丙丁四位同学
甲同学
乙同学
丙同学
丁同学
一平面镜竖直挂在墙壁上身高为1.65m的小明从镜前10m远处沿直线以2m/s的恒定速度垂直靠__面镜
课本介绍的分解太阳光的小实验你做过吗如右图在深盘中盛上一些水盘边斜放一个平面镜使太阳光射在平面镜上并
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如图所示蓄水池右侧竖直的墙壁上有一平面镜平面镜前有一发光点B潜水员在水中A点看到B点在平面镜中的像
10·达州一平面镜竖直挂在墙壁上身高为1.65m的小明从镜前10m远处沿直线以2m/s的恒定速度垂直
舞蹈教室有一面非常大的平面镜如图所示甲乙丙丁四位学生在教室内排练舞蹈当老师从外面进入到图示位置时他能
甲
乙
丙
丁
一平面镜竖直挂在墙壁上身高为1.65m的小明从镜前10m远处沿直线以2m/s的恒定速度垂直靠__面
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一平面镜竖直挂在墙壁上身高为1.65m的小明从镜前10m远处沿直线以2m/s的恒定速度垂直靠__面镜
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8分SheWalkedThroughFire OnThanksgivingweekendtheHeffelmirefamilygatheredforamealattheirhome.AfterdinnerthefamilywentdowntothefinishedbasementtorelaxexceptCharlotte'sfatherEricwhowasinthegaragetofixhistruck. Around8pmCharlottedecidedtocheckonherdad.Shewalkedthroughthekitchen.Whensheopenedthesidedoortothegarageblacksmokeroseupintothekitchen.Shecouldbarelymakeoutherfatherlyingonhisbacktrappedunderthetruck.He'dremovedthefrontpassenger﹣sidetyreandraisedthetruckonajack千斤顶.Thetruckhadslippedoffthejackandnowthewholeweightofthewheelwasonhischestandshoulders. Charlotterantothefrontofthetruckandstruggledtoliftit.EricwasstillconsciousandheyelledYougotit!Onemoretry!Shetriedagainandwasabletotipthetruckbackwardjustenoughforhertopullherdadbytheshirtwithbothhandsfromunderthetruck. Shedraggedhimacrossthegarageand20feetdownthedriveway.Thensheranbacktothegaragewhichhadburstintoflames.IwasafraidthecarwasgoingtoexplodesaysCharlottesosheclimbedintothetruckwhichfacedforwardturnedthekeyandpressedthegaspedal油门.Thecarslowlyrolledoutthemetalwheelscratchingloudlyagainsttheconcrete. SafelyonthedrivewayCharlottestoppedthetruckandranbacktothebasement.There'safire!Everybodygetout!sheyelledasshepickedupherthree﹣month﹣oldnieceandranout.Outsideshehandedthebabytohermomandthenranaroundtotheburninggarage.Shepickedupagardenhose水管andsprayedthefirewhilecalling911. Afewminuteslaterfirefightersandanambulancearrived.Charlottewastreatedforsecond﹣degreeburnsonbothherfeetandface.Herdadhadinjuriesonhischestandshouldersaswellasminorburnsonhisface.Thegarageandthehouseweredamagedbutthefamilysurvived. TheHeffelmiresarestayinginanapartmentwhiletheirhouseisrebuilt.Charlotteisaremarkablekidsaysherdad.CharlottehoweversimplysaysIwassavingmyfamilyandmyhouse.Iwasn'tgoingtoletmydaddie. 59.Ericgottrappedbecause. A.thekitchenwasonfire B.thewheelfelloffthetruck C.thefronttyrewasremoved D.thetruckslippedoffthejack 60.Whichofthefollowingisthecorrectorderoftheevents a.Charlottecalledthefirefighters. b.CharlottesavedEricfromunderthetruck. c.Charlottedrovethetruckoutofthegarage. d.Charlottewarnedthefamilytoleavethehouse. A.bcad B.abdc C.acbd D.bcda 61.Asaresultofthefire. A.thetruckexploded B.thehousewasnotfittolivein C.thethree﹣month﹣oldbabywasinjured D.Charlottewasburnedonherchestandshoulders 62.ItcanbeinferredfromthepassagethatCharlotteis. A.proudandclear﹣headed B.modestandeasy﹣going C.calmandquick﹣minded D.independentandself﹣centered.
如图已如平行四边形OABC中点O为坐标顶点点A30C12函数y＝k≠0的图象经过点C． 1求k的值及直线OB的函数表达式 2求四边形OABC的周长．
下列四个命题 ①两直线平行内错角相等②对顶角相等③等腰三角形的两个底角相等④菱形的对角线互相垂直 其中逆命题是真命题的是
计算﹣13+﹣π﹣1120﹣2tan60°
1分Weworrysomuchabouthim.Heisoldenoughtotakecareofhimselfatcollege. A.couldn't B.mustn't C.needn't D.daren't
下列图形既是轴对称图形又是中心对称图形的是
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