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Vim li cas qee cov khau manufacturers them ntau dua rau cov qauv khau?
Cov qauv no yog ib qho kev sim rau kev koom tes nrog cov tuam txhab khau. Thaum koj pom cov chaw tsim khoom khau tab sis tsis paub yog tias cov khoom tsim yuav ua tau raws li koj qhov kev cia siab, qhov no yog lub sijhawm peb xav tau cov qauv los txiav txim seb peb yuav tsum ua haujlwm nrog cov chaw tsim khoom khau. Tab sis ua ntej ntawd, muaj ib tug f ...Nyeem ntxiv