The cutting rock power models used at home and abroad now mainly are experienced formulae which are obtained by tests.

国内外现在使用的确定消耗在钻头破碎岩石功率的关系式主要是通过实验研究得到的经验公式。

youdao

According to the button bits test on optimum rotary Angle in cutting rock, the author put forward a view that is distinct from some specialists.

作者根据在实验室和矿山对柱齿钎头破岩的最优旋转角的测试结果，提出了与某些专家不同的看法。

youdao

Because the drilling cost is not the sole cost of bit, it is necessary to discuss here the highest rotation speed of bit in cutting rock at the lowest drilling cost.

在研究钴进过程的最佳化生产条件中，由于钻探成本的开支不是唯一的一项钻头费用，所以就有必要对最低钻探成本的最高钻头切割岩石的旋转速度进行探讨。

youdao

The muscular man is working hard to control a powerful drill that is cutting through the rock that surrounds him.

VOA: special.2009.03.23

These laborers had the job of cutting holes in rock.

VOA: special.2009.02.21

It had reached a depth of 428 metres on Saturday morning after cutting through 56 metres of rock in 24 hours.

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The wider use of horizontal drilling and hydraulic fracturing, or fracking, has unleashed a vast supply of natural gas from the shale-rock formations across the U.S., forcing down domestic prices, cutting the need for overseas imports and making gas-exporting nations in Africa, Latin America and the Caribbean a less important piece in the U.S. energy puzzle.

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