Nhanganyaya: Kana zvasvika kune pombi dzemvura, kudziyisa, uye kutonhora masisitimu, pombi dzemhangura dzagara dziri sarudzo yakakurumbira nekuda kwekunaka kwazvo kwekupisa uye magetsi conductivity, kusaita ngura, simba, ductility, uye kuwanda kwekudzivirira kwekushisa. Kufambidzana kumashure kwe10,000 makore, isu vanhu ...
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