Some experiences on stope roof management in metal underground mine are introduced.
介绍金属地下矿山采场顶板管理的几点经验.
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The safety thickness of roof forecasting model is obtained by stepwise regression analysis.
本文最后还分析了顶拱裂隙对安全顶板厚度的影响.
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型钢、面板加工; 轻钢结构 、 架制造 、 售; 钢材销售.
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They have a solar panel on their roof that powers their central heating.
他们在房顶上有一个太阳能电池板,为他们的中央暖气设备提供能源.
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