短語詞組短語polarity reversal switch 極性開關(guān)polarity -reversing switch 極性轉(zhuǎn)換開關(guān)signal polarity switch 信號極性轉(zhuǎn)換開關(guān);信號極性轉(zhuǎn)換automatic polarity switch 釋義自動極性開關(guān)signhas polarity switch 信號極性轉(zhuǎn)換開關(guān)current -polarity-reversal switch 電流極性換曏開關(guān) 返回 polarity switch