Ọla kọpa na-acha ọcha (cupronickel), alloy ọla kọpa nwere ụdị.Ọ na-acha ọcha ọlaọcha, n'ihi ya, a na-akpọ ya ọla ọcha.E kewara ya ụzọ abụọ: cupronickel nkịtị na cupronickel dị mgbagwoju anya.Cupronickel nkịtị bụ ọla kọpa-nickel alloy, nke a na-akpọkwa "De Yin" ma ọ bụ "Yang Bai Tong" ...
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