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Study on combined support technology of goaf floor roadway under the conditions of close coal seam spacing and several coal pillars
Hou Diankun1, Jin Huilong1,2, Bu Qingwei1
1. Inner Mongolia University of Science and Technology, Baotou 014010, China; 2. Qinghai Branch, China Huaneng
Group Corporation Ltd., Xining 810001, China


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