Na nhazi ọkwa mba ụwa, zinc metal metụtara ọgwụgwọ na mkpuchi elu, nnwale ihe igwe, ọla ndị na-abụghị ferrous, akụrụngwa pipeline na pipeline, kemịkalụ inorganic, ngwaahịa kemịkalụ, corrosion metal, Ngwuputa ígwè, ngwaahịa nchara, rọba, ngwaahịa textile. ins...
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