total effective air gap 总体的有效空气间隙
Total emission control of atmospheric pollutant is to control air pollution from an integrated viewpoint, and it is an effective way for improving the quality of regional atmospheric environment.
大气污染物总量控制是从总体上来控制大气污染的一种方法，是从根本上改善区域大气环境质量的有效途径。
Total emission control of atmospheric pollutant is to control air pollution from an integrated viewpoint, and it is an effective way to improve the quality of regional atmospheric environment.
大气污染物总量控制是从总体上控制大气污染的一种方法，是从根本上改善区域大气环境质量的有效途径。
Controlled cycle ventilation is a new ventilation system. We could increase the effective volume of wind at work face without increasing the total volume of fresh air in the mine.
受控循环通风是一种新型的通风方式，在不提高矿井总的新鲜风量的同时，就能提高工作面的有效风量。
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