rotary drilling

英 美
  • 旋转钻探
  • drilling n.演练;钻孔
  • rotary adj.旋转的n.旋转式机器;环形交叉路
    1. In rotary boring, rock penetration is achieved by the rotation of the hollow cutting tool.
      旋转钻探利用中空的切削工具通过旋转钻透岩石。