试题与答案

在化学反应前后 ①原子的数目;②元素的种类;③分子的数目;④物质的总质量,肯定没

题型:选择题

题目:

在化学反应前后

①原子的数目;②元素的种类;③分子的数目;④物质的总质量,肯定没有发生变化的一组是 [ ]

A.①②③

B.②③④

C.①②④

D.①③④

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C

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