1. Usoro iwepụ nchara ahịhịa ahịhịa na-eji akụrụngwa maka polishing ma ọ bụ mkpochapụ ajari aja. Mgbe e wepụsịrị nchara, e kwesịghị inwe ntụpọ nchara n’ala ahịhịa, a ga-ehichapụkwa mmanụ, griiz, ájá, ájá ígwè, na ígwè oxides nke ọma. Mgbe ewepu nchara, mkpuchi ala ga-abụrịrị spr ...
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