Piv nrog cov xim av corundum thiab dawb corundum, ib leeg siv lead ua corundum muaj siab hardness, toughness, ib leeg kheej kheej kheej kheej siv lead ua duab, thiab muaj zog tiv taus fragmentation.
Cov xim ntawm ib leeg siv lead ua corundum yog lub teeb daj, thiab cov khoom lag luam yog hexagonal siv lead ua
Post lub sij hawm: Apr-28-2023