提高等级,培训提升,叠积作用upgrading
升级换代upgrading and updating
精选厂concentrate upgrading plant【矿】
城乡电网改造projects for upgrading urban and rural power grids
提升upgrading
板材贴面panel overlay【木】;panel upgrading【木】
升级换代updating and upgrading (of products)
【化】 原油预处理crude oil upgrading