数据上看，煤矿开采的危险性要高于其他类型开采，但差别微乎其微。
Statistically, coal mining remains more dangerous than other kinds of mining, but only slightly.
本论文分析了煤矿空间信息系统的数据类型，定义了一套DTD文档。
This paper analyses data type of Coal Spatial Information System, then defines a series of DTD.
所建立的采场可靠性模糊综合评价模式，不仅适用于非煤矿山采场，而且适用于各种类型的矿山采场。
The mode for evaluating stope reliability built here can not only be used for the stopes of non-coal mines, but also for all sorts of mines.
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