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【单选题】
单一均匀掺杂的n型非半导体,半导体表面的到半导体内部存在电场分布,并且电场的方向从半导体表面指向半导体内部,电场的大小从表面逐渐向内部减小到零。问半导体的能带简图中,半导体表面的能级相对于半导体内部是。A.
向上弯曲。
B.
向下弯曲。
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【单选题】I preferred watching TV to _______ music last week． [ ]
A.
listen to
B.
listening
C.
listening to
D.
listened to
【单选题】I became a teacher because I preferred books and people ______ politics.
A.
than
B.
to
C.
rather
D.
against
【单选题】I preferred to go there by plane, but I hadn't enough money to pay for the _______. A．tripB．voy
A.
175. I preferred to go there by plane, but I hadn't enough money to pay for the _______. A．trip
B.
voyage
C.
journey
D.
Tour
【单选题】Rather than to school by bus, I preferred a bike.
A.
to go; to ride
B.
go; riding
C.
going; to ride
D.
go; to ride
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