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%.