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I have been a teacher for twenty years 对for twenty years提问
人气：411 ℃ 时间：2019-10-04 06:30:50
解答
How long have you been a teacher?
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英语翻译
如图所示的几何体中，四边形ABCD是正方形，MA⊥平面ABCD，PD∥MA，E、G、F分别为MB、PB、PC的中点，且AD=PD=2MA． （Ⅰ）求证：平面EFG⊥平面PDC；（Ⅱ）求三棱锥P-MAB与四棱锥P-ABCD的体积之比．
didn't 完全形式,sun形容词,Let's完全形式,all加个字母组成新单词
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