This paper focuses on a study of the classification method of natural disaster in the view of attribute interval recognition theory.
从属性区间识别理论的角度，探讨了自然灾害的等级划分方法。
The natural grade classification of loose-covered rock has a great effect on caving mining efficiency.
松散覆盖岩层的自然分级现象对使用崩落法开采的矿山开采效果有较明显的影响。
The natural grade classification of loose-covered rock has a great effect on caving mining efficiency.
松散覆盖岩层的自然分级现象对使用崩落法开采的矿山开采效果有较明显的影响。
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