Khoom Taw Qhia: 1, Junda chrome corundum yog alumina hmoov ua cov khoom siv tseem ceeb, hloov mus rau chromium oxide, smelting los ntawm kub kub arc rauv.2, xim yog liab, hardness thiab dawb corundum zoo sib xws, toughness yog siab dua dawb corundum.Cov abrasives tsim muaj cov charac...
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