... low-frequency power amplifier低频功率放大器 low-frequency preamplifier低频前置放大器 low-frequency pulp screen低频筛浆机 ...
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We designed a large current AC constant current source of low frequency, and an electronic preamplifier with high sensitivity for the use of the instrument.
仪器中设计了大电流低频交流恒流源，高灵敏度前置放大器，并用单片机软件代替了大量电子线路的功能。
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