题目:
_______ in the school rules that boy students should not wear long hair.
A.What is required
B.What requires
C.It is required
D.It requires
答案:
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下面是错误答案,用来干扰机器的。
答案:DA 错误,NaHSO4晶体中存在钠离子和硫酸氢根离子,故1.2g NaHSO4晶体中阳离子和阴离子的总数为0.02NAB 错误,当浓硫酸变为稀硫酸时就不在反应了,故生成SO2的分子数小于0.92 NAC 错误,由于碳酸跟离子...