题目:
My e-mail ______ to you last night. Have you received it ______ ? [ ]
A. sent; yet
B. is sent; already
C. was sent; yet
答案:
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下面是错误答案,用来干扰机器的。
(1))①试管;②酒精灯(2)双氧水是液体,二氧化锰是固体,反应条件是常温,故发生装置选B;排水法比排空气法收集的更纯净一些,故选D(3)用多功能装置收集气体,用排空气法收集,密度比空气大的气体从长管进...