The drill has variable speed control.
这钻机有变速控制。
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。
It can provide the base for noise control of pneumatic drill.
为气动凿岩机噪声治理提供了依据。
Normal bone drill: variable speed control without step, reliable, economical price.
普通骨钻：无级变速，性能可靠，经济实惠。
The problem is solved when the numerical control spherical surface drill press is used.
采用数控球面钻床，很好地解决了这一问题。
The problem is solved when the numerical control spherical surface drill press is used.
采用数控球面钻床，很好地解决了这一问题。
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