Manufacture of metal structures; Research and development of auto parts; Manufacture of auto parts and accessories; Manufacture of urban rail transit equipment; Manufacture of molds; Manufacture of rubber products; Manufacture of high-performance fibers and composite materials; Manufacture of plastic products; Processing of doors and windows; Sales of rubber products; Wholesale of hardware products; Retail of hardware products; Sales of metal products; Wholesale of auto parts; Retail of auto parts; Sales of chemical products (excluding licensed chemical products); Sales of rail transit specialized equipment, key systems and components; Loading and unloading; General cargo warehousing services (excluding items requiring permits such as hazardous chemicals); Goods import and export; Technology import and export; Sales of new automobiles. Permitted items: Road freight transport (excluding dangerous goods); Manufacture of road motor vehicles.