基本解释[經濟學]活塞調節閥词组短语短語piston governor valve strainer 活塞調節閥濾器piston governor valve cage 活塞調節閥座balanced -piston governor valve 平衡式活塞調節閥piston governor valve retaining spring 活塞調節閥釦緊簧piston governor valve更多词组专业释义經濟學活塞調節閥