| http://www.w3.org/ns/prov#value | - Carbide ball is denoted by HBW, when the ball is denoted by HBS. In the actual test, according to the test material type, sample size, hardness and other factors, the pressure of the ball using different diameter (diameter of the ball used 10mm, 5mm, 2.5mm, 1mm), and according to the degree of hardness components, can be used F/D2 different ratios, can have 30,10,5,2.5,1.
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