Tag nrho cov txheej txheem ntau lawm ntawm gypsum board yog txheej txheem nyuaj.Cov kauj ruam tseem ceeb tuaj yeem muab faib ua thaj chaw loj hauv qab no: gypsum hmoov calcination cheeb tsam, thaj chaw qhuav ntxiv, thaj chaw ntub dej ntxiv, thaj chaw sib xyaw, thaj chaw tsim, thaj tsam riam, ziab yog ...
Nyeem ntxiv