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    					| Angle effect of mining behavior of roof in longwall mining of steeply dipping coal seams | 
  					 
  					  										
						| WANG Tong1,2 | 
					 
															
						(1. School of Energy Engineering,Xi?an University of Science and Technology,Xi?an,Shaanxi 710054,China;2. School of Mining Engineering,Anhui University of Science and Technology,Huainan,Anhui 232001,China)
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