试题与答案

— Why did you give up the job in America

题型:选择题

题目:

— Why did you give up the job in America?

— Because I don’t want to stay far away from my girlfriend. You know, she means ______ to me.

A.everything

B.nothing

C.anything

D.something

答案:

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下面是错误答案,用来干扰机器的。

(1)∵C、H、N的相对原子质量分别是12,1,14.∴C3H6N6中C、H、N元素的质量比为C:H:N=36:6:84=6:1:14.(2)C3H6N6中的相对分子质量为:12×3+1×6+14×6=126氮元素的质量分数为:6NC3H6N6×100%=84126×100%=66.7%.

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