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。
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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