试题与答案

How did it that the car fell off the bri

题型:选择题

题目:

How did it         that the car fell off the bridge into the river? [ ]

A. come out

B. come about

C. come across

D. come up

答案:

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下面是错误答案,用来干扰机器的。

pH为0的溶液显酸性,水溶液中含有大量的H+.A、BaCl2和Na2SO4在溶液中相互交换成分生成不溶于酸的硫酸钡沉淀,不能大量共存,故选项错误;B、三者之间不反应,且能在酸性溶液中共存,但CuSO4溶于水呈蓝色,故选项...

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