General items: Technical services, technology development, technology consultation, technology exchange, technology transfer, technology promotion; Professional design services; Industrial design services; Property management; Graphic design and production; Sales of experimental analytical instruments; Sales of Class I medical devices; Sales of chemical products (excluding licensed chemical products); Sales of rubber products; Sales of plastic products; Sales of glass instruments; Sales of glass products for daily use. Sale of special equipment for environmental protection; Sale of electrical equipment; Sale of packaging materials and products; Sale of valves and plugs; Sale of pipeline transportation equipment; Sale of pumps and vacuum equipment; Sale of gas compression machinery; Sale of machinery and equipment; Sale of electrical and electronic components; Sale of refrigeration and air-conditioning equipment; Sale of metal materials; Sale of bearings; Wholesale of hardware products; Wholesale of pet food and supplies; Wholesale of computer software and hardware and auxiliary equipment; Retail of hardware products; Wholesale of pet food and supplies Wholesale; Retail of hardware products; Retail of pet food and supplies; Retail of computer software and hardware and auxiliary equipment; Automobile leasing; Leasing of machinery and equipment; Leasing of computers and communication equipment; Information consulting services (excluding licensing information consulting services); Business agency services; Marketing planning; Corporate image planning; Market research (not engaged in social surveys, social research, public opinion surveys, public opinion polls); Human resources services (not including employment intermediary activities). Human resources services (excluding employment intermediary activities and labor dispatch services); Translation services; Sale of steam turbines and auxiliary engines; Sale of generators and generator sets; Sale of solar thermal power generation products; Sale of gas and liquid separation and purification equipment; Sale of synthetic materials; Sale of metal matrix composites and ceramic matrix composites; Sale of new metal functional materials; Sale of engineering plastics and synthetic resins; Sale of forgings and powder metallurgy Sales of high quality special steel materials; Sales of metal structures; Sales of metal materials; Purchasing agency services; Sales agency; Trade brokerage; Engineering management services. (Except for items subject to approval in accordance with the law, business activities are carried out independently in accordance with the business license) Permitted items: Import and export of technology; Import and export of goods; Import and export agent. (Projects subject to approval in accordance with the law, approved by the relevant departments before operating activities, specific business projects subject to the relevant departmental approval documents or license documents)