题目:
_________in the regulation that you should not tell other people the password of your e-mail account. [ ]
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:B题目分析:原子序数依次增大,且X、Y、Z相邻。Y的核电荷数是Z的核外电子数的一半,可推出Y为O元素、Z为S元素,因为X、Y、Z相邻,所以X为N元素,Y与M可形成化合物M2Y,原子序数依次增大,M为前20号元素可知...