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Explosives and Explosive Ordnance Disposal
containing
岩 心 钻
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all forms
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in specified order only
Chinese
English
岩心钻
机
利用管状钻头的回转作用切削、磨碎岩石,并不断向深部钻进以提取岩心的机械
core drill
直径 1 1/4 无岩心标准钻头
1 1/4 BH
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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