Also, the resistor limits the ac gain of the feedback ammeter.

此外，该电阻器还限制回馈安培表的交流增益。

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Inside is arranged ammeter, voltmeter, air circuit breaker, indicator, ac contactor, conversion switch, and buttons for starting or stopping.

柜内还装有电流表、电压表、自动空气开关、指示灯、交流接触器、工频变频转换开关及起动、停止按钮等。

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