短语词组短语clean top gas 净化的炉顶煤气clean producer gas 净化发生炉煤气clean flue gas damper 净烟气挡板clean gas outlet 净化气体出口;净化气出口clean gas bleeder 净煤气放出阀clean gas pipe 净烟道clean gas fuel 洁净气体燃料clean gas heater 净燃气加热器Clean gas source 洁净气源 返回 clean gas