... classification by direction 按方向别分类 classification of accident 事故分类 classification of dangerous goods 危险货物分类 ...
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It should not be supposed, however, that the classification is a wholly meaningless accident of history.
然而，我们不应该就认为，这样的分类是完全无意义的历史事件。
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。
Study on the Construction and Classification of Gas Explosion Accident Prevention System in Coal Mine;
还在讨论此次瓦斯爆炸 的以外事故。
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