③Cov khoom siv mos mos feem ntau siv txij li xyoo pua 21st, cov mos txwv ceramics tau tsim sai heev, thiab muaj ntau yam xws li alumina, silicon carbide, boron carbide, silicon nitride, titanium boride, thiab lwm yam, ntawm cov alumina ceramics (Al₂O₃), silicon carbide cov...
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