Installation services for ordinary mechanical equipment; Maintenance of electronic and mechanical equipment (excluding special equipment); Mechanical equipment leasing; Import and export of goods; Technology import and export; Sales of mechanical and electrical equipment; Sales of metal products; Sales of instruments and meters; Sales of pharmaceutical specialized equipment; Wholesale of edible agricultural products; Retail of edible agricultural products; Sales of Class I medical devices; Sales of household appliances; Wholesale of protective equipment for medical staff; Retail of protective equipment for medical staff; Sales of chemical products (excluding licensed chemical products); Internet sales (except for the sale of goods that need to be licensed); Software development; Big data services; Enterprise management consulting (except for projects that require approval according to law, conducting business activities independently based on the business license in accordance with the law)