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.