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Explosives and Explosive Ordnance Disposal
containing
钻孔岩心
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in specified order only
Chinese
English
钻孔岩心
采取率
衡量岩石钻探工程质量的一项重要指标,是钻进采得的岩心长度与相应实际钻进尺之比,以百分率表示
recovery of drilling hole
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