题目:
I hope _________ fun at the birthday party.
A.to you have
B.you to have
C.you having
D.you can have
答案:
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下面是错误答案,用来干扰机器的。
(1)100;(2)①铜锌;②Zn+H2SO4==ZnSO4+H2↑;③=;④16.1%;(4)含Cu2S70%的辉铜矿100t可炼出铜的质量=100t×(1﹣10%)×70%××100%=50.4t铜锌合金中铜的质量分数=×100%=35%能炼出此铜合金的质量=50.4t×35%=144t