Full-pillar extraction by wide working face layout in partial mining是什么意思 Full-pillar extraction by wide working face layout in partial mining怎么读-字典翻译

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Full-pillar extraction by wide working face layout in partial mining

Full-pillar extraction by wide working face layout in partial mining是什么意思 Full-pillar extraction by wide working face layout in partial mining怎么读

利用宽条带实现全柱开采的方法

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