炉峪口煤矿9号煤层巷道布置方式及锚杆支护巷道矿压观测研究
로욕구매광9호매층항도포치방식급묘간지호항도광압관측연구
Study on the Roadway Layout Pattern and Anchor Bolt Supported Roadway ’s Mine Pressure Observation in No .9 Coal Seam of Luyukou Coalmine
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