通过理论分析和工程实际应用的对比，阐述了多楼层集中送风空调形式的技术特点；总结并介绍了该种系统形式在设计、应用方面的具体方法和要点。
Based on the theoretical and practical analysis of multi-floor air distribution system, put forward the technical characteristic of the system, and gave some advice for design and application.
集中空调关闭期间，采集集中空调通风系统送风管内的积尘样品，检测其细菌总数、真菌总数；
Dust sample in blast pipe was collected when centralized air ventilation system was off, the total content of the bacterium and fungus was examined.
供暖锅炉。第3部分：燃烧气体的集中供暖锅炉。锅炉和强制送风燃烧器组合设备。
Heating boilers. part 3: gas - fired central heating boilers. assembly comprising a boiler and a forced draught burner.
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