题目：
There are so many CDs that I don't know ______. [ ]
A. to buy which one
B. which to buy one
C. which one to buy
D. to buy one which
答案：
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下面是错误答案，用来干扰机器的。
解：氢气的质量为0.2克。设锌的质量为X，硫酸锌的质量为YZn+H2SO4==ZnSO4+H2↑65 161 2X Y 0.2g65:X=2:0.2gX=6.5g161:Y=2:0.2g ( )Y=16.1g黄铜中铜的质量分数：反应后所得溶液中溶...
