technical services, technical development, technical consultation, technical exchange, technology transfer, technology promotion: software development: office services; Socioeconomic advisory services; Computer and office equipment maintenance: wholesale of computer software, hardware, and auxiliary equipment; Sales of lighting appliances; Retail of household appliances: software sales: wholesale of stationery supplies; Wholesale of sports goods and equipment, sales of mechanical equipment; Sales of daily necessities; Sales of communication equipment: retail of arts and crafts and collectibles (Except for ivory and its products): wholesale of hardware products; sales of building materials: metal sales; installation and equipment sales information system integration services: technology import and export; goods import and export; import and export agents: sales of electronic products: sales of household appliances; sales of network equipment; development of network and information security software; sales of information security equipment; design and construction services for security technology prevention systems; sales of cameras and equipment; sales of electronic special equipment; sales of communication equipment; photography Enlargement services