Mini rock drill has been produced based on patented technology for rock drill warm extrusion.
采用钎头壳体温挤压精密成形专利技术生产了小型凿岩钎头.
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A drill bit used for obtaining core samples in concrete or rock formations.
钻头被用来在水泥或岩层获取岩芯样品.
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If they knew how difficult it was to drill through hard rock, they would lose heart.
如果他们知道要钻透岩石层有多么难, 他们一定会绝望的.
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The invention of pneumatic drill . This device compressed air to bore holes in the rock.
风钻的发明. 这种工具用压缩空气在岩石中打洞.
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能量法岩石可钻性测定系统是通过采集钻井井口岩屑并利用微机来测定岩石的可钻性。
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目前, 通用的设计方法是不考虑岩体的各向异性而采用固定的钻孔方向.
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