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【单选题】
射极输出器(________)。A.
没有电流放大，也没有电压放大
B.
有电流放大，也有电压放大
C.
有电流放大作用，没有电压放大
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举一反三
【单选题】When someone say "I was on the edge of my seat when watching that movie", that means _______.
A.
The movie was boring.
B.
He couldn't follow the movie.
C.
The movie kept his attention.
D.
He couldn't bear the movie and wanted to leave.
【单选题】听力原文：When is the movie supposed to start? (A) At Paramount theater. (B) At seven o'clock, (C) Oh no, we're late. (14)
A.
B.
C.
【单选题】Could you tell me _____ tomorrow afternoon?
A.
when the movie will start
B.
where will the movie start
C.
when will the movie start
D.
where the movie will start
【单选题】What does the author suggest as a solution for modern man to live well?
A.
Looking forward to new and better technology.
B.
Living a simple life.
C.
Trying not to rely too much on modern technology.
D.
Disuse of all those fancy gadgets.
【简答题】若流入某一节点有 4 个电流,已知 i 1 =5A , i 2 =2A , i 3 = - 3A ,那么 i 4 = 。
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