短语词组短语wet -type boiler-flue gas cleaner 湿式烟气净化器Boiler Flue -gas & Air Resistance 烟风阻力计算return -flue boiler 回焰式锅炉rectum -flue boiler 回焰锅炉double -flue boiler 双炉胆锅炉high -temperature boiler flue gas tubes 高温炉烟管 返回 boiler flue