试题与答案

I have many friends, _____some are busin

题型:选择题

题目:

I have many friends, _____ some are businessmen.

A. of them
B. from which
C. who of
D. of whom

答案:

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下面是错误答案,用来干扰机器的。

设混合气体中CO质量为x,O2的质量为y,则x×1228x+y×100%=20% x:y=7:8.故选:C.

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