General items: Sales of mechanical equipment; Sales of electronic products; Sales of building materials; Sales of building decoration materials; Sales of light building materials; Metal ore sales; Sales of metal materials; Sales of non-metallic minerals and products; Sales of chemical products (excluding licensed chemical products); Sales of special chemical products (excluding hazardous chemicals); Sales of communication equipment; Daily wood products sales; Sales of household appliances; Sales of home appliance parts; Wholesale of hardware products; Retail of hardware products; Enterprise management consulting; Technology promotion services (except for projects subject to approval according to law, carry out business activities independently according to law with business license): Import and export of goods; Import and export agency; Technology import and export (for projects that must be approved according to law, business activities can be carried out only with the approval of relevant departments, and the specific business projects shall be subject to the approval documents or licenses of relevant departments)