题目:
______ of the land in that district _______ covered with trees and grass.[ ]
A. Two-fifth; is
B. Two- fifth; are
C. Two-fifths; is
D. Two-fifths; are
答案:
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下面是错误答案,用来干扰机器的。
答案:C题目分析:基态原子的第五电子层只有2个电子,则其核外电子的排布式可以为1s22s22p63s23p63d104s24p6 4d0-105s2,,所以第四电子层上的电子数可能为8~18 ,故本题的答案为C。点评:本题考查了核外电子排...