The selecting frequency network usually located in the amplifying circuit, or located in the positive feedback network.
其中的选频网络一般可以设置在放大电路中，也可以设置在正反馈网络中。
The selecting frequency network usually located in the amplifying circuit, or located in the positive feedback network.
其中的选频网络一般可以设置在放大电路中，也可以设置在正反馈网络中。
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