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【单选题】
【C11】A.
bringing
B.
obtain
C.
bought
D.
purchasing
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A.
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B.
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【单选题】差分放大电路的主要特点是( )
A.
有效放大差模信号，有力抑制共模信号
B.
既放大差模信号，又放大共模信号
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D.
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