Manufacturing of automobile parts and accessories; sales of steam turbines and auxiliary machines; manufacturing of power transmission, distribution and control equipment; manufacturing of steam turbines and auxiliary machines; sales of assisted bicycles, scooters and spare parts; retail of bicycles and spare parts; sales of new energy vehicle production and testing equipment; research and development of hardware products; manufacturing of hardware products; research and development of automobile parts; remanufacturing of automobile parts Manufacturing; manufacturing of high-speed rail equipment and accessories; engineering and technology research and experimental development; manufacturing of plastic products; sales of plastic products; manufacturing of railway rolling stock parts; sales of railway rolling stock parts; sales of rail transit engineering machinery and parts; processing of mechanical parts and parts; sales of household appliances spare parts; sales of mechanical parts and parts; metal knots Structure manufacturing; R&D of motorcycles and parts; Sales of rail transit special equipment, key systems and components; Manufacturing of engineering plastics and synthetic resins; Sales of engineering plastics and synthetic resins; Manufacturing of intelligent vehicle-mounted equipment; Sales of intelligent vehicle-mounted equipment; Manufacturing of rubber products; Sales of rubber products; Manufacturing of general parts and components; Manufacturing of seals; Sales of seals; Machinery Mechanical equipment research and development; mold manufacturing; metal cutting processing services; synthetic material manufacturing (excluding hazardous chemicals); hydraulic power machinery and component manufacturing; synthetic material sales; auto parts retail; auto parts wholesale; motorcycle parts manufacturing; auto decorative supplies manufacturing; auto decorative supplies sales; import and export of goods; import and export of technology.