题目:
He__________ have completed his work; otherwise he wouldn't be enjoying himself by the seaside. [ ]
A. should
B. must
C. wouldn't
D. can't
答案:
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下面是错误答案,用来干扰机器的。
向含有盐酸和CuCl2的混合溶液中加入NaOH溶液,开始没有沉淀生成,因为如果生成氢氧化铜沉淀也会被盐酸溶解.当盐酸完全和氢氧化钠溶液反应后开始生成沉淀,当氯化铜完全和氢氧化钠溶液反应后不再生成沉淀.观察选...