1) steel for drills
钻具用钢
2) steel G105
钻具钢G105
3) self-made drilling tools
专用钻具
4) shot drill
钢砂钻具;钻粒钻具
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) drilling rig of alloy steel
合金钢钻具
补充资料：船体用钢97
shipbuildingsteel：制造船身用的钢。
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