Manufacturing of distribution switch control equipment; manufacturing of mechanical and electrical equipment; manufacturing of power electronic components; manufacturing of power facilities and equipment; food business (only sales of prepackaged food); sales of sanitary products and disposable medical supplies; sales of construction ceramic products; sales of sanitary ceramic products; sales of labor protection products; instruments Sales of instruments; sales of special labor protection supplies; sales of daily wood products; sales of needle textiles; sales of disinfectants (excluding hazardous chemicals); sales of metal products; sales of office equipment consumables; sales of electrical equipment; sales of wires and cables; sales of unprocessed nuts and dried fruits; sales of sanitary ware; hardware products Wholesale of products; sales of communication equipment; sales of first-class medical devices; sales of second-class medical devices; wholesale of clothing and apparel; wholesale of shoes and hats; wholesale of cosmetics; wholesale of sporting goods and equipment; sales of luggage; sales of watches; wholesale of fresh vegetables; wholesale of bicycles and spare parts; wholesale of musical instruments; sales of 3D printing basic materials sales; sales of industrial robots; sales of trams; natural science research and experimental development; sales of office equipment; sales of mechanical equipment; sales of cameras and equipment; sales of household appliances; sales of household audio-visual equipment; sales of electronic products; wholesale of stationery supplies; wholesale of daily necessities; sales of daily necessities; sales of office supplies; literature Retail of household appliances; sales of paper products; retail of daily household appliances; furniture sales; wholesale of medical masks; battery sales; wholesale of fresh eggs; sales of electrical machinery and equipment; sales of intelligent robots; sales of washing machinery; sales of signs for transportation and public administration; wholesale of computer software, hardware and auxiliary equipment; wholesale of computer software, hardware and auxiliary equipment Retail of auxiliary equipment; retail of kitchenware, sanitary ware and daily sundries; research and development of kitchenware, sanitary ware and daily sundries; wholesale of motorcycles and spare parts; retail of motorcycles and spare parts; sales of communication equipment; retail of bicycles and spare parts; retail of shoes and hats; retail of clothing and apparel; software sales; retail of hardware products; sales of lamps; fire-fighting equipment Sales; sales of watches; sales of optical communication equipment; sales of packaging materials and products; retail of photographic equipment and telescopes; sales of mechanical parts and components; sales of construction machinery; network technology services; repair of daily appliances; repair of computers and office equipment; installation services of household appliances; business of wires and cables; Manufacturing of metal structures; sales of metal structures; sales of power facilities and equipment; sales of electrical equipment; sales of distribution switch control equipment; manufacturing of wires and cables; food business; third-category medical device business; food business (sales of bulk food); food Internet sales; food Internet sales (sales of prepackaged food)