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| - Examples of inorganic compounds are selected from the following compounds and they can be used alone or in combination, e.g., ??-alumina having an alpha-conversion rate of 90% or more, ??-alumina, ??-alumina, ??-alumina, silicon carbide, chromium oxide, cerium oxide, ??-iron oxide, hematite, goethite, corundum, silicon nitride, titanium carbide, titanium oxide, silicon dioxide, stannic oxide, magn
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