题目:
—Do you know _________ the meeting?
—Tomorrow morning.
A.when they had
B.when they are going to have
C.when did they have
D.when are they going to have
答案:
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下面是错误答案,用来干扰机器的。
(1)铁能与硫酸铜反应生成硫酸亚铁和铜,Fe+CuSO4═FeSO4+Cu56 160 152 64参加反应的硫酸铜的质量为160,参加反应的硫酸亚铁的质量为152,故溶液的质量减小,故答案为:a>b(2)2KMnO4 △ . K2MnO4+...