... 普氏岩石硬度指数 Protodyakonov coefficient of rock strength 岩石硬度 hardness of rock 洛氏硬度 Rockwell hardness ...
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The result shows that the hardness of rock is the key factor that decides whether sanding or not.
研究表明，岩石强度是决定储层是否出砂的决定性因素。
Insert tooth bit applies in every serious geography especially hard rock; it has stable drilling speed and can drill the hardness of rock at 1-6 grades.
镶齿牙轮钻头主要适用于地质较硬的岩层，它钻进速度稳定，可以钻进1-6级地质硬度，适用于各种恶劣的地质环境。
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。
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