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。
This paper is based the full analyse and research of noise source of pneumatic drill.
对气动凿岩机产生的噪声声源进行了全面的分析研究，介绍了各声源的特性及测试方法。
This paper is based the full analyse and research of noise source of pneumatic drill.
对气动凿岩机产生的噪声声源进行了全面的分析研究，介绍了各声源的特性及测试方法。
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