炭窑沟矿井二4煤层1940~1985m水平工作面采前突出危险性评价
탄요구광정이4매층1940~1985m수평공작면채전돌출위험성평개
Assessment on Outburst Danger before Mining Operation of 1 940 ~ 1 985 m Level Coal Mining in Tanyaogou Mine
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