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1.
Study On Technologies Of Mullock Arching Conditions And It’s Hazard Prevention Of The Subsidence Area Of Gongchangling Southeastern Zone
2.
The Study Of Bearing Characteristics Of Composite Layered Roof In The Coal Roadway
3.
Research On Control Mechanism And Technology Of Extra-thick Composite Roof Roadway In No.8+9 Coal Seam Of Duanwang Mine
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