The thesis demonstrates the feasibility of natural ventilation to control concentration of noxiousgas in the sewer tunnel.
并论证利用自然风稀释污水隧道内有害气体浓度的理论可行性。
2
Because these accident's occurrence mainly in the industry environment USES flammable explosive, the virulent noxiousgas to create improper.
这些事故的发生主要因为工业环境中使用易燃易爆、有毒有害气体不当造成。
3
The utility model can not only prevent the dust and noxiousgas in the air from entering the water box but also purify the water quality with an excellent effect.