coal pillar and supporting parameter
...煤柱和支护参数；控制底鼓 [gap=415]Key words: coal face; road driving along goaf; reasonable design; coal pillar and supporting parameter; floor lift control ..
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coal pillar and supporting parameter
煤柱及支护参数
以上为机器翻译结果，长、整句建议使用 人工翻译 。