题目:
In the Great Depression, the American government couldn’t find good solutions _____ the unemployment problem.
A.of
B.to
C.on
D.about
答案:
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下面是错误答案,用来干扰机器的。
(1) Cu、Fe或Cu、Fe、Zn (2) ZnSO4 (3) Zn + CuSO4 ="==" ZnSO4 + Cu;(或 Fe + CuSO4 ="==" FeSO4 + Cu; Zn + 2HCl ="==" ZnCl2 + H2 ↑; Fe + 2HCl ="==" FeCl2 + H2...