Xov Xwm Txog Lub Tuam Txhab
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Daim Ntawv Pov Thawj Tub Yees: Tebchaws USA UL Daim Ntawv Pov Thawj Tub Yees & Lub Tub Yees Rau Kev Lag Luam Hauv Tebchaws Meskas
Daim Ntawv Pov Thawj UL (Underwriters Laboratories) yog dab tsi? UL (Underwriter Laboratories) Underwriter Laboratories (UL) yog ib lub tuam txhab pov thawj kev nyab xeeb qub tshaj plaws. Lawv pov thawj cov khoom, cov chaw, cov txheej txheem lossis cov kab ke raws li cov qauv thoob plaws kev lag luam....Nyeem ntxiv -
Daim Ntawv Pov Thawj Tub Yees: Mexico NOM Daim Ntawv Pov Thawj Tub Yees & Lub Tub Yees Rau Kev Lag Luam Mev
Daim Ntawv Pov Thawj NOM hauv Mexico yog dab tsi? NOM (Norma Oficial Mexicana) Daim ntawv pov thawj NOM (Norma Oficial Mexicana) yog ib qho txheej txheem ntawm cov qauv kev siv tshuab thiab cov cai siv hauv Mexico los xyuas kom muaj kev nyab xeeb, zoo, thiab ua raws li ntau yam khoom thiab cov kev pabcuam. Cov qauv no yog...Nyeem ntxiv