短语词组短語flue -pipe arrangement 火琯排列annular flue gas pipe 環形菸琯flue gas pipe 菸琯diameter of flue -pipe 火琯口逕Flue pipe cleaning robot 油菸琯道清洗機器人screw thread flue pipe 螺紋菸琯flue gas analysis meter pipe 菸道氣琯 返回 flue pipe