1. Hunhu hwemichina hwesimbi isina ngura, senge simba, kuramba kutenderera uye zvimwe zvinodiwa;
2. Kudzivirira ngura. Mamwe maworkpiece anoshandiswa munzvimbo dzakaoma, saka nzungu dzesimbi dzisina ngura dzinodiwa kuti dzirambe dzakasimba ngura;
3. Zvinodiwa zvekushanda tembiricha pakudzivirira kupisa (simba rekupisa kwakanyanya uye kuramba oxidation) yezvinhu;
4.Hunhu hwevatengi, mutengo uye zvinodiwa pakugadzirisa nzungu dzesimbi dzisina ngura.
Nguva yekutumira: Ndira-05-2022