General items: Internet of things technology research and development; Internet of things technical services; Software development; Sales of metal matrix composite materials and ceramic matrix composite materials; Sales of electrical accessories; Sales of high-performance fibers and composite materials; Sales of special chemical products (excluding hazardous chemicals) ); Sales of hydraulic power machinery and components; Sales of metal chains and other metal products; Sales of metal tools; Sales of building materials; Sales of high-performance non-ferrous metals and alloy materials; Sales of non-ferrous metal alloys; Sales of fire blocking materials; Sales of power electronic components; Sales of non-metallic minerals and products; Sales of engineering plastics and synthetic resins; Sales of mechanical parts and components; Sales of architectural ceramic products; Wholesale of refined oil (excluding hazardous chemicals); Fertilizer sales; Fertilizer sales; Food Internet sales (only sales Prepackaged food); Food sales (only prepackaged food); Agricultural and sideline products sales; Chemical products sales (excluding licensed chemical products); Grain sales; Metal materials sales; Rare earth functional materials sales; Machinery and equipment sales; Daily chemicals Product sales; Sales of ecological environment materials; Sales of bearings; Sales of metal products; Sales of security equipment; Sales of cement products; Sales of metal ore; Sales of software; Wholesale of jewelry; Sales of batteries; Sales of new energy prime movers; Sales of electric accessories for new energy vehicles; Wholesale of aquatic products; Wholesale of edible agricultural products; Sales of electronic products; Sales of furniture; Sales of wood; Sales of furniture spare parts; Sales of daily glass products; Sales of glass fibers and products; Sales of technical glass products; Sales of raw and auxiliary materials for shoemaking; Sales of raw materials; Sales of luggage; Sales of communication equipment; Sales of mobile terminal equipment; Wholesale of clothing and apparel; Wholesale of textiles, clothing and household goods; Sales of petroleum products (excluding hazardous chemicals); Sales of lubricants; Purchase of primary agricultural products; Wood processing; Furniture manufacturing; Internet sales (except for the sale of products that require license); Domestic trade agency; Property management; Non-residential real estate leasing; Information system integration services; Security technology protection system design and construction services; Information consulting services (excluding licensing information consulting services) ); Enterprise management consulting; Social and economic consulting services; Import and export of goods; Import and export of food; Import and export of technology (except for projects subject to approval according to law, independent business activities with business licenses) Licensed projects: Food sales; Art import and export Export (projects subject to approval according to law can only carry out business activities after approval by relevant departments. The specific business projects are subject to the approval documents or licenses of relevant departments)