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【单选题】
PN结加正向电压时,其正向电流是( )A.
多数载流子扩散而成
B.
少数载流子扩散而成
C.
多数载流子漂移而成
D.
少数载流子漂移而成
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【简答题】7 )为什么现代大容量同步电机都做出旋转磁极式?
【单选题】_who she was, she said she was Mr. Johnson's friend.
A.
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B.
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C.
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D.
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