General items: sales of off-road recreational vehicles and spare parts, sales of intelligent basic manufacturing equipment, retail of auto parts, camp service, sales of new energy vehicles, auto sales, tram sales, sales of auto decoration products, sales of mechanical equipment, research and development of mechanical equipment, sales of metal structures, sales of instruments and meters, wholesale of hardware products, sales of rubber products, sales of household appliances, sales of needles and textiles, technology import and export, Import and export of goods, conference and exhibition services (except for projects that need to be approved according to law, independently carry out business activities according to law with the business license)