Preliminary Analysis on Structure Feature of Drilling and Sampling in Soft Coal and CBM

GUOShi-li

doi:10.3969/j.issn.1672-7428.2011.12.011

2011 No. 12

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GUOShi-li. Preliminary Analysis on Structure Feature of Drilling and Sampling in Soft Coal and CBM[J]. DRILLING ENGINEERING, 2011, (12): 39-42. doi: 10.3969/j.issn.1672-7428.2011.12.011

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GUOShi-li. Preliminary Analysis on Structure Feature of Drilling and Sampling in Soft Coal and CBM[J]. DRILLING ENGINEERING, 2011, (12): 39-42. doi: 10.3969/j.issn.1672-7428.2011.12.011