穿层钻孔预抽煤层瓦斯有效半径考察方法研究

doi:10.11799/ce201802005

COAL ENGINEERING ›› 2018, Vol. 50 ›› Issue (2): 19-22.doi: 10.11799/ce201802005

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Received:2017-09-03 Revised:2017-10-19 Online:2018-02-20 Published:2018-04-23

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