1, Junda chrome corundum ndi alumina ufa monga chopangira chachikulu, chogwirizana ndi chromium oxide, chosungunula ndi ng'anjo yotentha ya arc. 2, mtundu ndi pinki, kuuma ndi koyera corundum ofanana, kulimba ndi apamwamba kuposa corundum woyera. Ma abrasives opangidwa ali ndi mawonekedwe ...
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