Group 1 - The company, Dongnan Network (002135.SZ), is a large professional architectural steel structure enterprise that integrates design, manufacturing, and installation [2] - The company's business primarily covers major national scientific installations, schools, hospitals, sports venues, airport terminals, exhibition centers, and high-speed rail station buildings [2] - The company has extensive construction experience in the conference and exhibition center sector, having participated in numerous significant projects including the National Exhibition and Convention Center and various international exhibition centers across multiple cities [2]