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金融市场的弱收敛。
By trial of fully mechanized caving in relatively thinner thick coal seam in Y. J. L. coal Mine, the problems in mining are raised and the ways to increase its unit production are discussed.
通过对云驾岭矿较薄厚煤层综放的开采实践,提出了开采中存在的问题,并对如何提高综放工作面单产进行了探讨。
By trial of fully mechanized caving in relatively thinner thick coal seam in Y. J. L. coal Mine, the problems in mining are raised and the ways to increase its unit production are discussed.
通过对云驾岭矿较薄厚煤层综放的开采实践,提出了开采中存在的问题,并对如何提高综放工作面单产进行了探讨。
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