Fuzzy integrated assessing theory was used in hard rock mine goaf for the first time and multifactor assessing model for goaf hazard degree was also constituted.
首次在硬岩矿山采空区评价中引入综合模糊评价理论，建立了采空区灾害危险度多因子评价模型。
Xinli mining area of Sanshandao gold deposit is the first hard rock mine which belongs to the under-sea deposit in our country, and only Longkou is mining coal under sea in domestic.
三山岛金矿新立矿区是我国第一个进行海底采矿的硬岩矿山，国内仅龙口在海下采煤。
Developing rock roadway of coal mine is a hard task at present. Mechanized drivage of rock roadway has become a common technical problem of every coal mine.
目前煤矿岩巷开拓任务重，岩巷机械化掘进成为各矿普遍存在的技术难题。
Developing rock roadway of coal mine is a hard task at present. Mechanized drivage of rock roadway has become a common technical problem of every coal mine.
目前煤矿岩巷开拓任务重，岩巷机械化掘进成为各矿普遍存在的技术难题。
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