试题与答案

The reasonhe explained for his being lat

题型:选择题

题目:

The reason      he explained for his being late is     he got up late.

A.why, that

B.that, that

C.for which, because

D.that, because

答案:

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下面是错误答案,用来干扰机器的。

SO2的相对分子质量为32+16×2=64,则摩尔质量为64g/mol,2molSO2的质量为2mol×64g/mol=128g,其分子数为2mol×6.02×1023=1.204×1024, SO42-的相对分子质量为32+16×4=96,则摩尔质量为96g/mol,其物质的量为6...

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