General items: Steel rolling processing; Non-ferrous metal rolling processing; Sales of metal materials; Sales of building materials; Sales of civil aviation materials; Sales of high-performance sealing materials; Metal structure sales; Sales of steel bar products for construction; Retail of hardware products; Wholesale of hardware products; Sales of mechanical and electrical equipment; Wire and cable management; Sales of building decoration materials; Sales of plastic products; Sales of electronic products; Sales of communication equipment; Retail of computer hardware and software and auxiliary equipment; Wholesale of computer hardware and software and auxiliary equipment; Sales of office equipment and consumables; Sales of household appliances; Sales of office supplies; Import and export of goods; Technology import and export; Advertising production; Advertising; Advertising design, agency; Conference and exhibition services; Marketing planning; Business management consulting; Corporate image planning; Technical services, technology development, technical consultation, technology exchange, technology transfer, technology promotion; Computer system services; Machinery and equipment leasing (except for projects subject to approval in accordance with the law, independently carry out business activities with a business license in accordance with the law).