Sand paper or a wire brush on an electric drill.
砂纸或钢丝刷对一个电钻。
In addition, this paper discusses the developing trend of mountain drill.
另外，本文还对山地钻机的发展趋势进行了探讨。
A novel drill tool threaded connection stress relief groove is proposed in the paper.
减少连接螺纹弯曲应力可以延长钻具连接螺纹的疲劳寿命。
Finally, the paper introduced effective control methods of common drill string vibration and deviation problem.
最后对常见的钻柱振动和井斜问题介绍了有效的控制方法。
Finally, the paper introduced effective control methods of common drill string vibration and deviation problem.
最后对常见的钻柱振动和井斜问题介绍了有效的控制方法。
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