Technical development, design and installation of automatic electrical engineering; Electrical automation system integration; Design, installation, commissioning and maintenance of mechanical automation equipment; Computer software development; Computer system services; Application software services; Wholesale, purchase and sale of general mechanical equipment and equipment, hardware and electrical equipment (excluding electric bicycles), hydraulic and pneumatic components and accessories, electronic computers and accessories, electronic products, instruments and meters, wires and cables, automation equipment, electric tools, office supplies, labor protection supplies, communication equipment, valves, pipe fittings, bearings, refrigeration equipment, compressors and accessories, construction machinery and accessories; Self-operated and agent import and export of all kinds of domestic goods and technologies, with the exception of goods and technologies that are restricted or prohibited by the state. (Projects subject to approval according to law can only be operated after being approved by relevant departments)