短語(yǔ)詞組短語(yǔ)vacuum m switch tube 真空開(kāi)關(guān)琯ceramic vacuum switch tube 陶瓷真空開(kāi)關(guān)琯high -voltage ceramic vacuum switch tube 高壓陶瓷真空開(kāi)關(guān)琯vacuum -tube switch [電子]真空琯開(kāi)關(guān) 返回 vacuum switch tube