horizontal tunnel

The phenomenon of backward flow of smoke resulted from a mine fire in a horizontal tunnel was investigated.

为掌握烟流滚退的发生规律，采用理论分析的方法，对水平巷道火灾的烟流滚退现象进行了研究，导出了滚退发生的条件式，并建立了２个无量纲准则。

eliminary research on the relation between oil-gas exploration effectiveness and exploration level.;

油气勘探成效与勘探水平关系初步研究

Analysis and Comprehensive Prevention and Cure the Pouring Water of Two Level in Mining Face;

二水平回采工作面涌水原因分析与综合防治

Talking about the reform of conveying system in the second level drift of Xinxing Coal Mine;

浅谈新兴矿五采区二水平运煤系统的改造