题干
Malaysia Airlines Flight MH370 was expected to land in Beijing the morning of March 8.
A： in
B：on
C：of
D：at
答案(点此获取答案解析）
B
Malaysia Airlines Flight MH370 was expected to land in Beijing the morning of March 8.
A： in
B：on
C：of
D：at
层电子的最大容量仍为2n2个。如果按此规律排布周期表，那么该周期表第3、4、5周期含有的元素分别有
