COAL ENGINEERING ›› 2014, Vol. 46 ›› Issue (7): 31-33.doi: 10.11799/ce201407011

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The unstable of the thickness mudstone roof of large span cut control of surrounding rock and supporting technology reasearch

  

  • Received:2013-08-14 Revised:2013-10-16 Online:2014-07-10 Published:2014-08-01