Experiment shows the rock breaking efficiency of jet flow impact pressure is enhanced.

实验表明，提高了射流冲击压力的破碎岩石效率。

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The main factors that influence the efficiency of rock-breaking are the down-hole rock properties and the rock-breaking tools and methods.

其破岩效率的主要影响因素是井下地层岩石性质、破岩工具和方法。

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The main factors that influence the efficiency of rock-breaking are the down-hole rock properties and the rock-breaking tools and methods.

其破岩效率的主要影响因素是井下地层岩石性质、破岩工具和方法。

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