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9. Vim li cas thiaj siab- zaus vuam? Dab tsi yog cov yam ntxwv ntawm high- zaus vuam?

Ua tau zoo thiab nrawm, siab vuam zoo, txuag hluav taws xob thiab kev tiv thaiv ib puag ncig, kev lag luam yooj yim, thiab ntau cov kev siv.
Qhov tsis zoo yog cov cuab yeej siv siab tau them tus nqi, muaj peev xwm ua haujlwm me me, yuav ua rau muaj kev cuam tshuam hluav taws xob, thiab tuaj yeem ua rau hluav taws xob corrosion thaum lub sijhawm vuam.