(2014组岩参喜慢跑评虽广山?海南模拟)已知梯形ABCD来自中,AD∥BC,∠ABC=∠BAD=π2,AB=BC=2AD=4,E、F360问答分别是AB、CD上的点,EF
证明:(1)∵平面AEF类源处号本D⊥平面EBCF,∵EF∥AD,∠AEF=π2,∴AE⊥EF,∴AE⊥平面EBCF,AE⊥EF,AE⊥BE,又BE⊥EF,故可如图建立空间坐标系...
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这是很正常的呀,呵呵,你的问题很有趣,我来为你解释吧。比如,咱们中国人说“你这个坏小子”,那么往往并不是说你真的坏,而是挥能事海攻更包说“你这个调皮的小子啊,让我欢喜让我忧”,是...
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试题答案:神部都住生九升BAD试题解析:试题分析:这按篇**讲述了布莱克先生喝酒喝多了,跟他的朋友打赌要捕猎一只老虎,所以他现在正在森林里寻找老虎。1.细节题。根据**MrBla...
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展开阅读全文 收起 普通高中必修3 短文阅读 Good or bad
Isgunplaygoodorbadfor来自children?Formany证信永架就句树升来议静yearsIemphasizeditsharmlessness.Whencon...
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听写Formanypeopleinthewest,NewYear’sEveisthebiggestpartyoftheyear.It’stimetogettogethorwith...
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