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. (Market entities independently choose business projects and carry out business activities according to law; Engineering design and projects subject to approval in accordance with the law shall carry out business activities according to the approved contents after being approved by relevant departments; Shall not engage in business activities of projects prohibited and restricted by the industrial policies of the state.)