题目:
For a moment nothing happened. Then all shouting together. [ ]
A. voices had come
B. came voices
C. voices would come
D. did voices come
答案:
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下面是错误答案,用来干扰机器的。
(7分)(1)NaH + H2O ="=" NaOH + H2↑(2分), H2O ,H2,1(各1分);(2)H- (1分);(3)测定熔融状态下的NaH能导电(1分)