在研究瓦斯危险源辨识方法、分类分级方法的基础上分析煤矿瓦斯危险源系统结构，通过典型事故案例剖析煤矿瓦斯事故危险源系统结构。
On the basis of studying on identification, classification, gradation of gas accident hazard, the structure of coal mine gas accident is analyzed by means of typical accident.
在研究瓦斯危险源辨识方法、分类分级方法的基础上分析煤矿瓦斯危险源系统结构，通过典型事故案例剖析煤矿瓦斯事故危险源系统结构。
On the basis of studying on identification, classification, gradation of gas accident hazard, the structure of coal mine gas accident is analyzed by means of typical accident.
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