短語詞組短語double bank commutator switch 雙聯(lián)轉(zhuǎn)換電門voltmeter commutator switch 電壓轉(zhuǎn)換開關(guān)ammeter commutator switch 電流轉(zhuǎn)換開關(guān)commutator change over switch 換向器;切換開關(guān)emergency commutator switch 應(yīng)急轉(zhuǎn)換開關(guān) 返回 commutator switch