The abrasive dirt in the muzzle. wa. s brought back into the chamber and forcing. cone…
在枪口的磨料污垢在被带回进入会议厅，并迫使锥… 。
Abrasive hardness measurement method, more commonly used are hand-cone method, mechanical cone method, Rockwell hardness tester hardness measurement method and blasting assay.
测定磨具硬度的方法，较常用的有手锥法、机械锥法、洛氏硬度计测定法和喷砂硬度计测定法。
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