短語(yǔ)詞組短語(yǔ)polarity reversal switch 極性開關(guān)polarity -reversing switch 極性轉(zhuǎn)換開關(guān)signal polarity switch 信號(hào)極性轉(zhuǎn)換開關(guān);信號(hào)極性轉(zhuǎn)換automatic polarity switch 釋義自動(dòng)極性開關(guān)signhas polarity switch 信號(hào)極性轉(zhuǎn)換開關(guān)current -polarity-reversal switch 電流極性換向開關(guān) 返回 polarity switch