 2011, Vol. 30 Issue (3): 646-648 DOI: |
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| (1. Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines，Hunan University of Science and Technology，Xiangtan，Hunan 411201，China；2. School of Energy and Safty Enginerring，Hunan University of Science and Technology， Xiangtan，Hunan 411201，China) |
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