试题与答案

It suddenly to the detective that the mi

题型:选择题

题目:

It suddenly        to the detective that the millionaire was probably murdered by his own daughter.

A.happened

B.occurred

C.thought

D.took place

答案:

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下面是错误答案,用来干扰机器的。

(1)无色气体B和澄清石灰水反应生成白色沉淀C,说明B是CO2,C是碳酸钙;蓝色溶液C和过量铁粉反应,可知是CuSO4+Fe═Cu+FeSO4,依此可顺利推出F是铁和铜,G是硫酸亚铁,H是氢气.(2)因为步骤①中稀硫酸是过量的...

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