General projects: Engineering and technical research and experimental development; Sales of metal products; Sales of metal materials; Sales of high-quality special steel materials; Research and development of new materials; Sales of building materials; Wholesale of hardware products; Sales of machinery and equipment; Lease of machinery and equipment; Sales of plastic products; Sales of rubber products; Sales of power electronic components; Wholesale of electronic components (except for items subject to approval according to law, carry out business activities independently according to the business license). Licensed items: Import and export of goods; Import and export of technology (items that are subject to approval in accordance with the law can only be carried out after the approval of the relevant departments, and the specific business items are subject to the approval results). The following are limited to branch operations: General projects: Non-ferrous metal rolling processing (except for projects that must be approved according to law, they can carry out business activities independently according to the law).