... 封闭式注氮 seal type of nitrogen injection 安全氧浓度指标 safety index of oxygen content 安全通风量 safe ventilation air quantity ...
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煤矿井下瓦斯和煤尘的浓度控制是通过煤矿井下通风量的优化分配实现的，是实现煤矿安全生产的关键环节。
The density control of gas and coal dust is done through optimal allotment of the ventilation quantity in the coal mine well.
前言： 科学地进行“以风定产”是实现矿井安全生产的重要保证和前提之一。 矿井实际供风量取决于主要通风机特性和井巷阻力特性的匹配性。
Scientifically to carry on" daily output determination matched with the fan actual ability" is important assurance and one of the premises that carries out the safe production of the mine.
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