General items: Import and export of goods; Manufacturing of metal tools; Repair of specialized equipment; Repair of general equipment; Maintenance of electronic and mechanical equipment (excluding special equipment); Wholesale of hardware products; Sales of electrical equipment; Sales of mechanical and electrical equipment; Sales of electronic products; Wholesale of auto parts; Sales of daily necessities; Sales of chemical products (excluding licensed chemical products); Technology import and export; Import and export agency; Domestic trade agency; Sales of metal products; Research and development of metal products; Manufacturing of metal chains and other metal products; Sales of metal chains and other metal products; Manufacturing of new building materials (excluding hazardous chemicals); Sales of building materials; Manufacturing of sports goods and equipment; Retail of sports goods and equipment; Manufacturing of building decoration, plumbing parts, and other building metal products; Manufacturing of hardware products; Research and development of hardware products. (Except for projects that are subject to approval according to law, business activities shall be carried out independently in accordance with the business license. )