This paper analyses that fresh air and return air efet IAQ in air-conditioning system at present.

分析了目前空调系统新风和回风对室内空气品质的影响。

youdao

This paper analyses that fresh air and return air efet IAQ in air-conditioning system at present.

分析了目前空调系统新风和回风对室内空气品质的影响。

youdao