Manufacturing of modified automobiles; manufacturing of modified automobiles, low-speed trucks, trams, automobile bodies, trailers, new energy vehicle parts, tractors, mechanized agricultural and horticultural machinery, agricultural, forestry, animal husbandry and fishery machinery parts, environmental protection special equipment, fire-fighting equipment and apparatus, special machinery for water resources, civil air defense engineering protective equipment, civil air defense engineering anti-chemical equipment, desulfurization and denitrification equipment, sports goods, special production vehicles, and sewage treatment equipment; production of special equipment; sales of sports goods and equipment, stationery, cement, sand and gravel, concrete prefabricated parts, special vehicles, and sewage treatment equipment; wholesale of steel, hardware products, building decoration materials, office supplies, wires, cables, electrical equipment, automobiles and parts; construction of sports venue facilities; operation of sports venues; installation services for sports equipment and electromechanical equipment; construction labor subcontracting; engineering decoration; environmental consulting; trading of automobile parts; technical services for mechanical equipment; testing technical services for motor vehicles and engineering machinery; testing technical services for engineering machinery; engineering technical services.