Ibyuma bidasa bivuga ibyuma byibintu bitandukanye (nka aluminium, umuringa, nibindi) cyangwa ibivange bimwebimwe byakozwe mubyuma bimwe byibanze (nkibyuma bya karubone, ibyuma bitagira umwanda, nibindi) bifite itandukaniro rikomeye mubintu bya metallurgjiya, nkumubiri prope ...
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