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【单选题】
直流负反馈在放大电路中的主要作用是()。A.
提高输人电阻
B.
降低输人电阻
C.
提高增益
D.
稳定静态工作点
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A.
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B.
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C.
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D.
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A.
not more than
B.
other than
C.
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D.
more than
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