题目内容

当信号频率等于放大电路的fL和fH时，放大倍数的值约下降到中频时的。

A. 0.5
B. 0.7
C. 0.9

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当信号频率等于放大电路的fL和fH时，增益约下降。

A. 3dB
B. 4dB
C. 5dB

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