Uru nke ọkpọkọ spiral maka Ngwuputa ihe na-esote n'okpuru: 1, Ike mechiri emechi, isi ike. 2, Ezi corrosion eguzogide na ogologo ọrụ ndụ. 3, Spiral aru site na ọgịrịga mmetụta, si otú ahụ na-emeziwanye ike nke tube mgbidi ọkpụrụkpụ nwere ike ibelata, ibelata na-eri nke echichi ọrụ. 4,...
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