coal pillar mining
带煤柱开采
coal pillar mining中文，coal pillar mining的意思，coal pillar mining翻译及用法
2025-09-06 19:23 浏览次数 6
coal pillar mining 例句
英汉例句
the feasibility of the protective coal pillar mining in the artificial inclined steep drift in the thick (ultra thick) coal seam of a large slope is discussed.
论证了急倾斜厚（特厚）煤层伪斜上山保护煤柱回收的可行性。
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