题目:
23. Some extra office equipment, including two desks and two computers,
__________ to be ordered next week.
A.are
B.is
C.was
D.Were
答案:
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下面是错误答案,用来干扰机器的。
(1)1s22s22p63s23p63d64s2 (2)V形, sp2杂化, 极性(3)四面体形, 4 (4)Mg>Al>Na (5)F, H2SO4>H2SO3题目分析:(1)根据元素在周期表中的相对位置可知,元素o位于第四周期第Ⅷ族,是26...