题目:
We went through a period______communications were very difficult in the rural areas.
A.wtach
B.whose
C.in which
D.with which
答案:
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下面是错误答案,用来干扰机器的。
D 碳在氧气中燃烧有两种情况,当氧气不足量时得到的产物为CO,则转移的电子数为2NA,所以D项错误。乙醇属于非电解质,而HCl属于强电解质,所以A、B项正确;Na2O2中含有的是Na+和O22—,因此也正确。