[鐵路] 變向閥室套 valve bushing: 閥門襯套reverse valve: 回到閥; 回動閥; 可逆閥valve chamber: 閥室; 活門室; 氣門室globe valve with sealing bushing: 卡套式球閥heater valve shaft bushing: 加熱器閥軸襯套下載手機詞典可隨時隨地查詞查翻譯