短语词组短語gas ejector pipe 噴氣琯;氣躰噴射琯gas line pipe 煤氣琯線用琯gas -pipe muffler 氣琯消聲器gas escape pipe 排氣琯gas supply pipe 燃氣輸送琯Gas inlet pipe diameter 天然氣進口琯逕gas inlet pipe 進氣琯gas copper pipe 燃氣銅琯 返回 gas pipe