Manufacturing of special equipment; design of special equipment; inspection and testing of special equipment; installation, modification and repair of special equipment; construction engineering; specialized construction operations. General items: sales of special equipment; manufacturing of environmental protection special equipment; sales of environmental protection special equipment; leasing of special equipment; manufacturing of material handling equipment; sales of material handling equipment; sales of intelligent material handling equipment; manufacturing of metallurgical special equipment; sales of metallurgical special equipment; research and development of nuclear power equipment complete sets and engineering technology; manufacturing of mechanical and electrical equipment; sales of mechanical and electrical equipment; manufacturing of general parts; manufacturing of gears, gear reducers and gearboxes; industrial internet data services; manufacturing of IoT equipment; intelligent control system integration; manufacturing of motors; research and development of motors and their control systems; manufacturing of industrial automatic control system devices; sales of industrial automatic control system devices; development of artificial intelligence basic software; artificial intelligence industry application system integration services; software development; technology import and export; goods import and export; sales of tunnel construction special machinery; manufacturing of tunnel construction special machinery; sales of construction engineering machinery; manufacturing of metal structures; sales of metal structures; sales of mechanical equipment; leasing of mechanical equipment; installation services for general mechanical equipment; sales of railway rolling stock parts; sales of railway transportation equipment; sales of railway transportation basic equipment; sales of high-speed rail equipment and accessories; sales of anti-corrosion materials; manufacturing of domestic waste treatment equipment; sales of domestic waste treatment equipment; operation of wires and cables; manufacturing of electrical accessories; sales of electrical accessories; manufacturing of mining machinery; labor services (excluding labor dispatch)