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【单选题】
关于PN结说明正确的( )。 A.PN结有多子扩散少子漂移,所以有电流 B.称作PN结的空间电荷区中间没有自由电子和空穴 C.PN结具有单向导电性,当加上正向电压时就一定有电流 D.PN结具有单向导电性,当加上反向电压时有微弱的电流,通常看作截止。A.
B.
C.
D.
D
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【简答题】属于我国原产和特产,有“菜中之王”美誉的叶类蔬菜是( )。
【简答题】小麦条锈病的发生和流行主要取决于( )、( )以及( )。
【简答题】The author’s purpose in writing this passage is ________. A) to describe the difficulties in solving humanity’s current problems B) to present the different views on humanity’s current problems C) to ...
【简答题】Defining the meaning of 'happiness' is a perplexing proposition because it is very difficult to ______.
【单选题】We went through a period communications were very difficu1t in the rura1 areas. （ ）
A.
which
B.
whose
C.
in which
D.
with which
【单选题】As well as being intangible, what is the problem with emotions ?
A.
They are difficult.
B.
They are compounded.
C.
They are difficult to qualify.
D.
They do not operate in isolation.
【单选题】The two rings are so alike thatit is difficult to tell one theother ．
A.
． very ； to
B.
． much ； to
C.
． much ； from
D.
． very ； from
【单选题】choice of investigation in case of detection of dismotility in esophageal dysphagia?
A.
Endoscopy
B.
Biopsy
C.
Manometry
D.
Video fluoroscope
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