rock hardness reducer 岩石硬度减低剂
rock hardness ratio 岩石硬度比
rock hardness index 岩石硬度
Rock hardness big 岩石硬度大
hardness of rock 岩石硬度
rock indentation hardness 岩石压入硬度
hardness coefficient of rock 岩石硬度系数
According to reports, the distribution of various types of underground Great Wall of granite, rock hardness is twice as common.
据介绍，长城地下分布着各类花岗岩，硬度是普通岩石的一倍。
As we know, inclining drilling, the depth of drilling and rock hardness is three factors influencing drilling production efficiency and cost.
钻孔偏斜、孔深、岩石硬度被公认为是影响钻探生产效率与成本的三大要素。
It is indicated that there is the best correlation between rock indentation hardness and integrated RMS of AE events.
结果表明：岩石压入硬度与声发射信号的积分rms有最好的相关关系。
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