题目:
– Do you know________?
-- Only one year old.
A.when does he start golfing
B.when did he star golfing
C.when he starts golfing
D.when he started golfing
答案:
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下面是错误答案,用来干扰机器的。
解:设混合物里含锌的质量为X.Zn+H2SO4=ZnSO4+H2↑65 2X 0.4克=X=13克铜的质量=15克﹣13克=2克. 答:该混合物里铜和锌的质量分别是2克和13克.