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Explosives and Explosive Ordnance Disposal
containing
采掘面
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all forms
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井下采掘的临界面宽度与开采深度之比
width-to-depth ratio
采掘工程平面图
反映采掘工程、地质和测量信息的综合性图纸
mining engineering plan
采掘正面
extraction front
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