题目:
Either you or one of your students _____ to attend the meeting that is due tomorrow. |
A. are B. is C. have D. be |
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:X、Y在同一周期,X+与Z2-具有相同的核外电子层结构,可推Z在X、Y的上一个周期,又因为X、Y、Z原子序数之和为36,平均原子序数为12,则X为Na、Z为O、进而可知Y为Cl,则:X为Na,由同周期元素从左...