厚煤层分岔区下分层回采巷道位置选择

厚煤层分岔区下分层回采巷道位置选择

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Journal of Shandong University of Science and Technology (Natural Science) ›› 2020, Vol. 39 ›› Issue (03) : 43-49. DOI: 10.16452/j.cnki.sdkjzk.2020.03.005

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