Auto parts and accessories manufacturing; Automobile wheel manufacturing; Railway rolling stock parts manufacturing; High-speed rail equipment, accessories manufacturing; Auto parts research and development; Non-ferrous metal alloy sales; Sales of high-performance non-ferrous metals and alloy materials; Mechanical and electrical equipment manufacturing; General equipment manufacturing (excluding special equipment manufacturing); General purpose parts manufacturing; New material technology research and development; New material technology promotion services; Sales of graphite and carbon products; Technical service, technology development, technology consultation, technology exchange, technology transfer, technology dissemination; Metal material manufacturing; Electronic special equipment manufacturing; Manufacturing of power electronic components; Sales of power electronic components; Sales of metal matrix composites and ceramic matrix composites; Sales of high performance fiber and composite materials; Sales of new metal functional materials; Synthetic materials sales; Sales of new ceramic materials; Non-metal shipbuilding; High performance fiber and composite material manufacturing; Sales of high quality special steel materials; Sales of civil aviation materials; Sales of electronic special materials; Integrated circuit manufacturing; New energy vehicle sales; New car sales; Air transport equipment sales; Sales of railway transport infrastructure; High-speed rail equipment, accessories sales; Research and development of household appliances; Sales of household appliances; Sales of electronic products; Communication equipment manufacturing; Mobile communication equipment manufacturing; Mobile terminal equipment manufacturing; Special equipment sales; Mobile terminal equipment sales; Optical communication equipment sales; Communication equipment sales; Satellite mobile communication terminal sales; Mobile communication equipment sales. (Except for the items subject to approval according to law, independently carry out business activities according to law with the business license) Permitted items: Civil aircraft parts manufacturing; Road motor vehicle production; Railway rolling stock manufacturing; Special equipment design. (For projects subject to approval according to law, business activities can only be carried out after approval by relevant departments, and specific business projects shall be subject to approval documents or license certificates of relevant departments)