Manufacture and sale of special passenger vans (complete vehicle modification), special trucks (including dump trucks), general truck trailers, ordinary tank vehicles, and special operation vehicles; manufacture, sale, repair, and service of snow removal equipment, auto parts, sanitation equipment, agricultural machinery, and engineering machinery; sale of automobiles (excluding cars) and automobile tires; wholesale and retail of auto parts and steel; manufacture and sale of metal processing machinery; repair of Class II large and medium trucks and Class II small vehicles; road freight transport agency services; leasing of mechanical equipment; design, manufacture, sale, research, development, repair, and leasing of sludge treatment equipment; urban and rural garbage sweeping services, urban and rural road washing services, urban and rural snow clearing services, urban and rural garbage transport services, urban and rural kitchen waste removal services, urban and rural garbage classification services, urban and rural garbage incineration services, urban and rural garbage landfill services, urban and rural garbage composting services, and urban and rural waste cooking oil treatment services; public toilet management services; catering waste and kitchen waste treatment services; greening management, maintenance, pest control services; property management; building cleaning services; afforestation and forest cultivation; pruning and trimming of plants; forestry pest control services; landscaping engineering services; landscape and green space facility engineering services; soil remediation; slag transport services; recycling of renewable materials; highway maintenance services; environmental protection and governance consulting services; municipal management consulting services; mechanical engineering research services; environmental science and technology research services; environmental sanitation engineering design services; environmental protection technology promotion services; software development; information technology training services; foreign trade.