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Explosives and Explosive Ordnance Disposal
containing
导向板
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底板导硐-上向回采法
用于平硐、隧道和巷道的爆破方法。分段或者一次全长开挖断面下面的部分,或在底板导硐,上面部分则通过回采或分层开挖使其破碎
bottom heading - overhand stoping
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