Research and development of mechanical equipment; sales of mechanical equipment; leasing of mechanical equipment; installation services for general mechanical equipment; manufacturing of construction machinery; sales of construction machinery; manufacturing of specialized machinery for building materials production; manufacturing of specialized machinery for tunnel construction; sales of specialized machinery for tunnel construction; manufacturing of general-purpose equipment (excluding special equipment); manufacturing of environmental protection specialized equipment; sales of environmental protection specialized equipment; manufacturing of general parts; processing of mechanical parts and components; sales of mechanical parts and components; manufacturing of general feeding and distributing devices; sales of general feeding and distributing devices; leasing services (excluding licensed leasing services); research and development of waste asphalt recycling technology; research and development of construction waste recycling technology; manufacturing of metal structures; sales of metal structures; manufacturing of furnaces, ovens, and electric furnaces; sales of furnaces, ovens, and electric furnaces; metal surface treatment and heat treatment processing; spray coating processing; manufacturing of non-metallic mineral products; landscaping engineering construction; loading and unloading handling; sales of mechanical and electrical equipment; sales of electrical equipment; repair of electrical equipment; repair of specialized equipment; leasing of construction machinery and equipment; maintenance of electronic and mechanical equipment (excluding special equipment); business training (excluding educational training, vocational skills training, and other training requiring licensing); research and development of carbon emission reduction, carbon conversion, carbon capture, and carbon sequestration technologies; technical services, technical development, technical consulting, technical exchange, technology transfer, and technology promotion; engineering and technological research and experimental development; system integration services; data processing services; industrial internet data services; information technology consulting services; system operation and maintenance services; software development; software sales; information consulting services (excluding licensed information consulting services); sales of solar thermal power generation products; sales of photovoltaic equipment and components; solar power generation technical services; research and development of bio-based material technologies; sales of ecological environment materials; sales of bio-based materials; manufacturing of domestic waste treatment equipment; sales of domestic waste treatment equipment; municipal facility management; sales of lighting fixtures; energy-saving management services; environmental protection consulting services; processing of building stone; sales of building materials; manufacturing of concrete structural components; sales of concrete structural components; sales of non-metallic ores and products; earthwork engineering construction; trade brokerage; labor services (excluding labor dispatch); import and export of goods; import and export of technologies; contracting of foreign projects; property management; corporate headquarters management. Licensed items: Construction engineering construction (excluding nuclear power station construction and operation, and civil airport construction); electrical installation services; road motor vehicle production; highway management and maintenance; roadbed and pavement maintenance operations; construction labor subcontracting; power generation, transmission, and distribution (supply) business.