Construction engineering machinery manufacturing; Construction engineering machinery and equipment operating lease; Research, development, production, sales, leasing, repair, and technical services of agricultural machinery, metallurgical machinery, environmental protection machinery, mining machinery, electrical machinery, general machinery, livestock machinery, aquaculture machinery, environmental monitoring special instruments, special vehicle equipment and accessories; Import and export of goods and technology; Agricultural machinery services; Land remediation services; Metal casting; Manufacturing of metal structures, motors, bearings and transmission components; Machining, repair and fitting; Operating tertiary industry (within the scope permitted by law); Sales of automobiles and parts, steel, and building materials; Mechanical equipment technology development services, engineering technical consulting services; Information technology consulting services; Technology contracting and transfer; Agricultural technical services, technical consulting (excluding intermediary services), technology transfer; Engineering and technological research and experimental development; Environmental protection monitoring; Environmental protection engineering construction; Operation of authorized assets through investment, holding, equity participation, merger, spin-off, etc.; Accommodation and catering (operated by branches); Publication printing (operated by branches); Sales of labor protection products (operated by branches).