Design, production, sales, and service of multifunctional power vehicles, special vehicle modification, generator sets, power trailers, automation control systems, and power trailer modification; development, design, production, sales, and technical services, technical consulting, inspection, and repair of special-purpose vehicles, trailers, and generators; research, development, production, and sales of new energy, new materials, and new technology products; modification of special vehicles and research, development, production, and sales of large panel shelters and electronic shelters; research, development, production, and sales of hybrid-electric propulsion systems, special power supplies, and energy storage systems; sales of diesel engine special oils, wires and cables, generator set parts, and communication products; design and treatment of machine room noise reduction; environmental engineering; import and export of goods and technologies; general contracting of mechanical and electrical engineering construction.