Engineering design; Technology development and transfer, technical services and technical consultation; Design, integration, installation, debugging and management of computer systems; Sales of edible agricultural products, daily necessities, Wujinjiaodian (excluding electric bicycles), chemical products, mechanical and electrical equipment, metal materials, computer hardware and peripheral equipment, office equipment, communication equipment, electrical equipment, household appliances, electronic products, kitchen equipment and stationery; Undertaking exhibitions; Public relations planning; Design, produce, represent and publish advertisements; Organize cultural and artistic exchange activities; Product design.