Coal pillar support roof method
以上为机器翻译结果，快速获取精准的人工翻译结果，建议选择有道人工翻译
[矿业] roof control by wall-shape pillar
... rolled stock shape consistency 轧制件形状均匀性 roof control by wall-shape pillar 煤柱支撑顶板法 sap-shape 汁状 ...
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