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【单选题】
多电子原子中,在主量子数为n,角量子数为 l 的亚层的轨道数是( )A.
2l-1
B.
n+l
C.
2l+1
D.
n-l
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举一反三
【单选题】The girl _____ her mother . I know her mother likes reading,too.
A.
achievement
B.
familiar
【单选题】I know her ______, but I have never spoken to her.
A.
for sight
B.
in sight
C.
on sight
D.
by sight
【单选题】______ are the earliest inhabitants of the British islands.
A.
Anglo-Saxons and Celts
B.
English
C.
Welsh
D.
Scots
【单选题】The Scots, Welsh and Irish are descendents of ___________.
A.
the Romans
B.
the Anglo Saxons
C.
the Celts
D.
the French
【简答题】In the year 1066, the Normans defeated the Anglo-Saxons at the battle of______.
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