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Explosives and Explosive Ordnance Disposal
containing
baby
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English
Chinese
baby
cut
空孔掏槽
沿煤层掘进的巷道,俗称顺槽。井下在夹有煤的岩层中开挖的水平巷道,既可作为采掘的巷道,也可作为运煤和通风的巷道。煤的厚度在1baby2m 时,首先用掏槽孔爆破煤层,然后崩落岩石,一次爆破完成
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