Txheej xwm hloov tshiab| JUNRAY tau nthuav tawm ntawm CIEPEC 2023
Lub 21st Tuam Tshoj International Environmental Protection Exhibition CIEPEC 2023 tau ua tiav nyob rau hauv Beijing - Tuam Tshoj International Exhibition Center (Chaoyang Hall) txij lub Plaub Hlis 13-15, 2023. Organi...