COAL ENGINEERING ›› 2014, Vol. 46 ›› Issue (10): 173-176.doi: 10.11799/ce201410049

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Analysis on the Strata Behavior Characteristics Under the Condition of Hard and Thick Roof Weakening

  

  • Received:2013-08-22 Revised:2013-10-08 Online:2014-10-10 Published:2014-10-10