好神奇喔 真的看到了...
Hardness Conversion Chart (HRA-HRC) - General Carbide 別罵我 因為我也被耍了... Rockwell "A" Rockwell "C" 91.8-92.8 79.5-81.5 91.5-92.5 79.0-81.0 90.5-91.5 77.0-79.0 90.2-91.2 76.5-79.5 89.8-90.8 75.6-77.6 89.0-90.0 74.0-76.0 88.5-89.5 73.0-75.0 88.0-89.0 72.0-74.0 87.5-88.5 71.0-73.0 87.0-88.0 71.0-72.0 86.0-87.0 69.0-71.0 83.0-84.5...
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