BSCI Daim Ntawv Tshaj Qhia Txog Lub Tuam Txhab hauv 2021 Saib ntxiv Ncav cuag Saib ntxiv RoHS Saib ntxiv Sgs daim ntawv qhia Saib ntxiv SGS tshaj tawm2 Saib ntxiv Qhia Txog Qhov Tshiab Saib ntxiv ISO system ntawv pov thawj ISO9001 ISO14001 ISO45001