宁东煤田"三下"压煤条带煤柱穿巷开采技术的适用性及其关键力学问题研究
저동매전"삼하"압매조대매주천항개채기술적괄용성급기관건역학문제연구
Research on the Key Mechanical Problems and Applicability for Mining Passed through Mine Gateways about "Three-under" Pressure Coal in Ningdong Coal Field
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