General items: Sales of metal materials; High performance non-ferrous metals and alloy materials sales; Non ferrous alloy sales; Mechanical equipment sales; Sales of metal products; The second category of medical device sales; Wholesale of medical masks; Wholesale of protective articles for medical staff; Sales of disinfectants (excluding hazardous chemicals); Sales of rubber products; Hardware products wholesale; Sales of building materials; Sales of labor protection articles; Sales of industrial textile products (except for the items that need to be approved according to law, they can independently carry out business activities according to law with their business license) license items: Import and export of goods; Technology import and export (for projects that need to be approved according to law, business activities can only be carried out after being approved by relevant departments, and the specific business projects shall be subject to the approval results)