l _______ the blackboard but l couldn't _____anything

相关推荐

• 海豚靠尾部来推动下部的水，能够从水中高高跃起，被誉为“会飞的鱼”．一身长l=1.8m，质量m=65kg的海豚，跃起后从h1=1.0m的高度处*下落，尾部接触水面后经过时间t=0.25s身体速度降为零，紧接着尾部用力F向下拍打水，又向上跃起h2=0.5m，假定上升、下降两个阶段尾部与水的作用力分别都是恒力，求上升阶段尾部与水的作用力F．（取g=10m/s2）
• Why didn"t you give the wallet to the man at once?He ____ before l realized it was his.A.had been disappearedB.has disappearedC.had disappearedD.has been disappeared我选D 这两个有什么区别?
• A、B两个小球由柔软的细线相连，线长l=6m；将A、B球先后以相同的初速度v0=4.5m/s，从同一点水平抛出（先A后B），相隔时间△t=0.8s．（1）A球抛出后经多少时间，细线刚好被拉直？（2）细线刚被拉直时，A、B球的水平位移（相对于抛出点）各多大？（g取10m/s2）
• 直线l:y=mx+t过A(-3,4),P是直线l上的动点,M是坐标轴(x轴或y轴)上的动点,如果三角形APM是以A为直角顶点的等腰直角三角形,且点A关于直线PM的对称点D恰好落在另一条坐标轴上（不同于M的坐标轴上）.求所有符合条件的直线l的函数解析式.
• 根据下列情景写6句话的作文Caller:l'm Adam Green.My doctor says that I'm not in good shape and I need to lose about four ahd a half kilos.I don't like sports.Do you have any advice?Someone called a radio program for suggestions.What advice would you give him?Please write a letter to him about your advice.
• 英语翻译slm mrhb ben türkiye oturuyorum adım metin sen türkiye demi oturuyor sun türkçe konuşa biliyormusun türkçe konuşabiliyorsan sana arkadaşlık teklif etsem kabul edersin türkiyede istambulda oturu yorum mardin doğumluyum.cevap bekliyorum
• 以T.J.L开头的唯美英文句子..
• 如图，质量m=2kg的物体静止于水平地面的A处，A、B间距L=20m．用大小为30N，沿水平方向的外力拉此物体，经t0=2s拉至B处．求物体与地面间的动摩擦因数μ．
• 冀教版英语五年级上册阳光作业第十九课最后一题(B)怎么做(B)Ann:Hello,354789.Bill:Hello.This is Bill.Who's that,please?Ann:It's Ann,Ann Smith.Bill:Is your father at home?Ann:No,he's at school.Bill:Who's at home now?Ann:My brother and I.Bill:Where's your mother?Ann:Sorry,l don't know.I think she's going to a shop.Bill:Which shop is she going to?Ann:There's only one shop near our house.Bill:I think i can find her in the shop.Ann:You're right.Bill:Goodbye.Ann:Goodlye.根据对话内容补全单词，完成句子
• 电阻量纲的物理意义如何推算R的量纲为L的平方乘M乘T的-3次方乘I的-2次方
• It is so dark outside that she ( )go out aloneA.dare not B.dares not to 应该选哪一个能说下理由吗
• They looked in the garden.But they couldn't ____the child.A.look B.look at C.see D.find