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【多选题】
PN结具有单向导电性，是指（）。A.
P区电位高、N区电位低
B.
P区电位高、N区电位低
C.
正偏时有较大的电流流过，等效电阻较小，处于导通状态
D.
反偏时有较小的电流流过，等效电阻较小，处于截止状态
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【简答题】A．Prestige schools may not be better. B．The quality is about the same is every school. C．Prestige schools are always the best. D．In a good school the students always learn more.
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A.
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B.
sure of
C.
real to
D.
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A.
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the same like
C.
the same that
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the same as
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A.
the same to
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the same as
C.
the same with
D.
the same for
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