1) positive displacement drill
容积式钻具
2) cordwood-type compound turbodrill
积木式组合涡轮钻具
1.
Experimental research on the cordwood-type compound turbodrill
积木式组合涡轮钻具试验研究
3) vertical boring tool
立式钻具
4) cable drilling tool,cable tools
绳式顿钻钻具
5) steel barrel type barer
钢管式钻具
1.
The mechanical principle and the manufacture of the steel barrel type barer,and its operation in the substation ground network construction have been introduced.
介绍了钢管式钻具的制作、构造原理 ,以及在变电所接地网敷设中的应用情况。
6) fluidic drilling tool
射流式钻具
1.
The structure and manufacture of new type of bits,working principle and types of fluidic drilling tools,action mechanism of anti-cave-in thinners,for difficult formation drilling were discussed.
阐述了难钻进地层用新型金刚石钻头的结构、制造特点,射流式钻具的原理、类型,以及防塌型稀释剂的作用机理。
补充资料：积木
儿童玩具，是一套大小和形状不相同的木块，大多是彩色的，可以用来摆成多种形式的建筑物的模型。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条