使用污染损失率法对矿山井下空气质量进行了评价。
Assessment on mine air quality by using pollution loss rate is conducted.
煤矿主扇风机的主要功能是保证井下空气畅通新鲜，降低瓦斯浓度。
The function of the main fan in coal mine is to keep fresh air and reduce the concentration of gas.
第二，研究激光在井下空气中的传播规律及扫描点云数据的误差影响因素。
Secondly, the laser propagation rule in the underground air and error influencing factors of scanning point clouds were studied systematically.
研究激光光束在井下空气介质中的传播规律，从理论和实践上探索和分析井下激光能量衰减的主要原因。
The propagation characteristics of laser beam in underground air medium were studied, primary causes of the laser energy decaying in the underground were explored theoretically and practically.
昨天早上，搜救人员就已经到达矿井下，但是由于空气质量越来越差，可能会导致新的爆炸，他们不得不出来…
Crews did start down into the mine yesterday morning, but they had to come back out because the air quality got worse and threatened a new blast.
但是，空气锤、特别是配套冲击钻头断脱导致的井下事故时有发生，影响因素极为复杂。
But the matching impact bits often dropped off from the pneumatic hammers and led the well accident caused by complex factors.
本文通过理论计算和实际分析表明，井下爆破空气冲击波对爆破网路有着较大的破坏作用。
In this Paper, the theoretical calculation and Practical analysis Showthat the blasting network Systems are broken by blasting Shock Wave.
生产和销售井下制冷机组、空气冷却器；煤矿安全监控系统及其传感器；井下人员管理系统；井下无线通信系统。
Provide productions including refrigerating units, air coolers, coal mine safety monitoring system, underground person-location and management system, and underground wireless communication system.
矿用通风湿式变频除尘系统，用于对煤矿井下掘进工作面的空气进行除尘。
Mine ventilation frequency wet dust removal system for the heading face of coal mine dust in air.
矿用通风湿式变频除尘系统，用于对煤矿井下掘进工作面的空气进行除尘。
Mine ventilation frequency wet dust removal system for the heading face of coal mine dust in air.
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