短語(yǔ)詞組短語(yǔ)waste gas main duct 廢氣總管hot gas outlet duct 熱空氣出口管gas outlet duct 氣體出口管gas main duct 煤氣總管gun gas bleed duct 機(jī)炮排煙導(dǎo)管seal gas extraction duct 密封氣體抽氣管gas exhaust duct 排氣管道hot -gas supply duct 高溫氣體供氣管道kiln exhaust gas duct 窯排氣管 返回 gas duct