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An on - off switch allows current to flow only when it is in the closed ( on ) position.
对,使开关电流流只有当它在禁闭 ( 上 ) 的立场.
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An on - off switch with pilot light , reversing switch and power rheostat are mounted on the base.
开关还附有指示灯, 转换装置及电阻在底座上.
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