Kev siv ntau tshaj plaws hauv kev tsim khoom yog qhov nyuaj ntawm kev nias-hauv txoj kev, xws li Brinell hardness, Rockwell hardness, Vickers hardness thiab micro hardness.Qhov tau txais hardness tus nqi tseem ceeb sawv cev rau qhov tsis kam ntawm cov hlau nto rau cov yas deformation los ntawm kev nkag mus rau ...
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