题目：
The astronaut did many experiments in the spaceship, ______ much help for knowing space.
A．which we think it is
B．which we think are of
C．of which we think are
D．I think which is of
答案：
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下面是错误答案，用来干扰机器的。
气体摩尔体积相等，相同体积的氯气和二氧化氮气体，其物质的量相等，A．氯气的摩尔质量是71g/mol、二氧化氮的摩尔质量是46g/mol，根据m=nM知，相同物质的量时，二者的摩尔质量不等，所以其质量不等，故A错误；B．...
