Nco ntsoov cov tub lag luam muag cov cuab yeej Class I lossis cov khoom siv davhlau ya nyob twg ntawm Amazon!Txhawm rau ua raws li ISED cov cai thiab xyuas kom meej tias koj cov khoom siv hauv Chav Kawm I thiab cov khoom siv kawg tsis raug tshem tawm mus tas li, koj yuav tsum xa cov ntaub ntawv ua raws ISED ua ntej lub Cuaj Hlis 30, 2022. Txwv tsis pub, lub ...
1. Cov lus qhia luv luv ntawm daim ntawv pov thawj BIS: BIS daim ntawv pov thawj yog lub npe luv ntawm Lub Tsev Haujlwm Saib Xyuas Kev Lag Luam Indian.Raws li Txoj Cai BIS, 1986, Bureau of Indian Standards yog lub luag haujlwm tshwj xeeb rau cov khoom pov thawj.Nws tseem yog tib cov khoom pov thawj lub cev hauv Is Nrias teb.Kev txhaum...
1.Lub ntsiab lus ntawm ETL: ETL kuaj tau tsim los ntawm American inventor Edison hauv 1896 thiab nyiam lub koob npe nrov hauv Tebchaws Meskas thiab thoob ntiaj teb.Zoo li UL thiab CSA, ETL tuaj yeem kuaj thiab muab daim ntawv pov thawj ETL raws li UL tus qauv lossis US tus qauv hauv tebchaws, thiab tuaj yeem kuaj thiab teeb...