Software development; Research and development of mechanical equipment; Research and development of intelligent robots; Sales of industrial robots; Manufacture of intelligent instruments and meters; Manufacture of specialized instruments for environmental monitoring; Manufacture of ecological environment monitoring and testing instruments; Sales of instruments and meters; Manufacture of power electronic components; Sales of power electronic components; Digital technology services; Industrial internet data services; Information system integration services; Industrial design services; Information technology consulting services; Information consulting services (excluding licensed information consulting services); Professional design services; Energy conservation management services; Environmental protection monitoring; Technical services, technology development, technology consulting, technology exchange, technology transfer, technology promotion; Sales of mechanical equipment; Manufacture of electrical signal equipment devices; Sales of electrical signal equipment devices; Manufacture of counting instruments for transportation equipment and production; Manufacture of transformers, rectifiers, and inductors; Manufacture of capacitors and supporting equipment; Manufacture of photovoltaic equipment and components; Retail of computer software, hardware, and peripherals; Sales of electronic products; Sales of communication equipment; Sales of power distribution switchgear equipment; Sales of railway rolling stock parts; Sales of high-speed rail equipment and accessories; Repair of electrical equipment; Repair of instruments and meters; Repair of specialized equipment; Maintenance of electronic and mechanical equipment (excluding special equipment); Sales of specialized equipment, key systems, and parts for rail transit; Import and export of goods; Import and export of technology; Leasing of non-residential real estate; Property management. Licensed items: Internet information services; Design of building intelligent systems; Construction engineering construction; Electrical installation services; Repair and maintenance of railway rolling stock; Installation, repair, and testing of power transmission, supply, and reception facilities; Specialized construction operations.