短语词组短語MYERS Submersible Sewage Pump 美國美亞潛水式汙水泵submersible sewage pump impeller 潛汙泵葉輪centrifugal submersible sewage pump 離心式潛汙泵sewage ejector submersible pump 噴射式潛入汙水泵 返回 submersible sewage pump