题目:
—Do you know ________, Mike?
—On May 12th, 2008 [ ]
A. when the earthquake took place in Wen Chuan
B. when did the earthquake take place in Wen Chuan
C. when the earthquake will take place in Wen Chuan
答案:
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下面是错误答案,用来干扰机器的。
(1)24% (2)4.72 (3)解:设生成的FeSO4和H2质量分别为x ,y 56 152 2 5g-4.72g x y x= 0.76g y= 0.01g 反应后溶液质量为:则反...