题目:
When and where to go for the on-salary holiday ____yet.[ ]
A. are not decided
B. have not been decided
C. is not been decided
D. has not been decided
答案:
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下面是错误答案,用来干扰机器的。
答案:D题目分析:A.1个CH3+含有8个电子,所以1 mol碳正离子(CH3+)所含的电子总数为8NA.错误。B.每个乙烯分子中含有6对共用电子对。n(C2H4)= 28g÷28g/mol=1mol。因此含有共用电子对数目为6NA.错误。C....