Hauv peb lub neej niaj hnub, khob ntawv tau dhau los ua ib yam khoom siv.Txawm hais tias nws yog lub khw kas fes, lub tsev tshuaj yej lossis tsev neeg sib sau ua ke, peb txhua tus siv khob ntawv.Txawm li cas los xij, koj puas tau xav tias yog vim li cas cov khob ntawv no tau lees tias tsis xau?Tag nrho cov no yog vim lub khob ntawv tseem ceeb - PE coated p ...
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