1. Peb tuaj yeem pib los ntawm cov tub ntxhais tooj liab hlau tawv tawv. Feem ntau hais lus, tag nrho-tooj liab hlau yog cov khoom tshiab rau txheej txheej, thaum tooj liab tsis muaj oxygen yog cov khoom tshiab rau sab hauv thiab sab nraud. Koj tuaj yeem tshawb xyuas qhov ci ntawm cov xov thiab txiav ib daim xov kom pom tias nws tuaj yeem ua nyias. Cov ci yog cov khoom siv tshiab, thiab cov uas tuaj yeem ua kom nyias nyias yog cov khoom siv tshiab. Txawm li cas los xij, tam sim no tag nrho-tooj liab cable tseem tab tom mus rau cov ntaub ntawv tshiab sab hauv thiab sab nraud, yog li nws tsuas tuaj yeem siv los ua lub hauv paus.
2. Los ntawm ntu ntu ntawm cov tub ntxhais tooj liab, feem ntau, tooj liab tsis muaj oxygen tsis muaj qhov sib tov sib xyaw ua ke, thiab ntu ntu yog tooj dag. Txhua lub tooj liab yog coated nrog tooj liab tsis muaj oxygen ntawm txheej txheej, yog li qhov chaw tooj liab yuav dawb me ntsis.
3. Hlawv nrog hluav taws, saum npoo ntawm txhua tus tooj liab yog txheej nrog txheej txheej tsis muaj oxygen. Thaum lub sijhawm txheej txheem hlawv, koj yuav pom tias txheej txheej txheej ntawm cov tooj liab tsis muaj oxygen yuav yaj, thiab tom qab ntawd so nrog ntawv, koj yuav pom tias cov tub ntxhais tooj liab nyuaj hloov pauv mus rau qhov qub Cov xim ntawm tooj liab yog tooj dag; tooj liab tsis muaj oxygen tsis muaj qhov tsis huv. Thaum lub sijhawm txheej txheem hlawv, tsuas yog saum npoo yog oxidized. Tom qab so nrog ntawv, nws tseem rov qab daj.
