Chav da dej txee kho vajtse

Cov khoom siv hauv chav da dej feem ntau suav nrog cov hlua hlau, pob khawm, cov hlua khi, thiab lwm yam, thiab nws cov khoom siv feem ntau yog cov hlau tsis muaj steel lossis steel nto txau, txau, thiab cov ntsiab lus hauv qab no yuav tsum tau them sai sai rau thaum siv:
1. Tsis txhob nchuav cov kua qaub thiab alkaline muaj zog ncaj qha rau ntawm cov khoom siv, thiab so nws tam sim ntawd yog tias nws tshwm sim.
2. Lub qhov rooj hinges yuav tsum qhib thiab kaw dawb, thiab tiv thaiv los ntawm ntub thiab xeb.
3. Khaws cov hlua khi ntawm lub tub rau khoom kom tsis txhob rub thiab ua kom huv si.