N'ime nhazi nke ụlọ ọrụ mmepụta ihe, a na-echekwa ọla kọpa na ọla kọpa alloy workpieces dị ka ọla, ọla kọpa na-acha uhie uhie, na ọla kọpa ruo ogologo oge, nchara ọla kọpa ga-apụtakwa n'elu.Nchara ọla kọpa n'elu akụkụ ọla kọpa ga-emetụta àgwà, ọdịdị na pr ...
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