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  2020, Vol. 39 Issue (7): 1343-1355    DOI: 10.13722/j.cnki.jrme.2019.0855
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Experimental study on the size characteristics of rock fragments during borehole drilling in coal mine roadway floors#br#
LIU Shaowei1,2,3,FU Mengxiong1,JIA Housheng1,2,ZHANG Weiguang3
(1. School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo,Henan 454000,China;2. The Safety of Coal Production Collaborative Innovation Center,Jiaozuo,Henan 454000,China;3. Department of Mining Engineering,Xinjiang Institute of Engineering,Urumqi,Xinjiang 830091,China)
 
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