Ọgwụ, onye na-elekọta ngwaahịa, ụtaba, nri na ihe ọṅụṅụ nkwakọ, mmanya, mmiri ara ehi na ngwaahịa, uwe ngwa, akpụkpọ anụ, electronic components, chemical ụlọ ihe ndị ọzọ ọrụ. Nwere ike kanye-abụghị metal na akụkụ nke metal. Ọtụtụ-eji nri nkwakọ, onunu nkwakọ, ...
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