General project: Sales of metal products; Sales of metal materials; Sales of building materials; Sales of building decoration materials; Sales of anti-corrosion materials; Sales of rubber products; Sales of plastic products; Sales of electrical equipment; Sales of instruments and meters; Wholesale of hardware products; Retail of hardware products; Mold sales; Sales of building waterproofing membrane products; Sales of metal structures; Sales of electronic products; Sales of mechanical equipment; Sales of valves and cocks; Operation of wires and cables; Wholesale of electronic components; Sales of mechanical parts and components; Sales of packaging materials and products; Sales of doors and windows; Sales of communication equipment; Sales of daily necessities; Sales of household appliances; Sales of labor protection equipment; Wholesale of automotive spare parts; Sales of bearings, gears, and transmission components; Installation services for ordinary mechanical equipment; Electrical equipment repair; Special equipment repair; Domestic trade agency; Domestic freight forwarding agent; Import and export of goods; Technology import and export. (Except for projects that require approval according to law, business activities shall be conducted independently based on the business license in accordance with the law)