白坪矿井开拓掘进工作面29#U型钢支架巷道变形量的初步统计、分析及其治理
백평광정개탁굴진공작면29#U형강지가항도변형량적초보통계、분석급기치리
Preliminary Statistics,Analysis and Management on Deformation of Baiping Mine Tunneling Face 29#U Type Steel Stents Roadway
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