短語詞組短語piston governor valve strainer 活塞調(diào)節(jié)閥濾器piston governor valve cage 活塞調(diào)節(jié)閥座balanced -piston governor valve 平衡式活塞調(diào)節(jié)閥piston governor valve retaining spring 活塞調(diào)節(jié)閥釦緊簧 返回 piston governor valve