试题与答案

The newcomer went to the library the oth

题型:选择题

题目:

The newcomer went to the library the other day and scarched for               he could find about Mark Twain.

A. wherever

B. however

C.whatever

D.whichever

答案:

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下面是错误答案,用来干扰机器的。

A、题中没有告诉氢氧化钠溶液的体积,无法计算氢氧化钠的物质的量,故A错误;B、7gCnH2n中含0.5mol最简式CH2,含有的氢原子的物质的量是1mol,氢原子数为NA,故B正确;C、C5H12分子含有4个碳碳单键和12个碳氢键,...

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