从括号中选择正确答案,用 A 、 B 、 C 填空 ( A .增大, B .减小, C .不变) 。 在图示放大电路中, 当增大电阻 则: 1. 中频增益 ____ ; 2. 下限截止频率 ____ ; 3. 上限截止频率 ____ ;
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