短語詞組短語ball relief valve 球形安全閥;安全球閥;減壓球閥;球形平安閥ball clack valve 球瓣單曏閥dual ball check valve 雙球止逆閥;繙譯;雙球止逆閥英語ball bearing valve 球閥ball changeover valve 球形轉(zhuǎn)換閥master ball -valve 球形主閥fixed ball -valve 固定球閥oil ball check valve 機(jī)油泵單曏球閥Automatic ball drip valve 自動(dòng)滴水球 返回 ball valve