下金刚石取芯钻头。
下金刚石取芯钻头。
Diamond core bit is preferred for coring operation in terms of the special requirements of scientific drilling.
根据科学钻探对岩心的特殊要求，认为金刚石取心钻头是科学深钻取心钻进较理想的选择。
The bit is usually a drag bit fitted with either PDC or natural diamond cutting structures, but the core bit is unusual in that it has a hole in its center.
钻头通常属于刮刀型，装备有PDC或者天然金刚石切削齿，但取芯钻头的特别之处在于钻头中心有一孔。
A new type of thin-wall diamond core drill bit is developed through the analysis of drilling feature on the r.
通过对在钢筋混疑土、花岗岩等建筑物上钻孔特点的分析，本文设计了一种新型的取芯式薄壁金钢石钻头。
A new type of thin-wall diamond core drill bit is developed through the analysis of drilling feature on the r.
通过对在钢筋混疑土、花岗岩等建筑物上钻孔特点的分析，本文设计了一种新型的取芯式薄壁金钢石钻头。
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