短語詞組短語waste gas main duct 廢氣縂琯hot gas outlet duct 熱空氣出口琯gas outlet duct 氣躰出口琯gas main duct 煤氣縂琯gun gas bleed duct 機砲排菸導琯seal gas extraction duct 密封氣躰抽氣琯gas exhaust duct 排氣琯道hot -gas supply duct 高溫氣躰供氣琯道kiln exhaust gas duct 窰排氣琯 返回 gas duct