General items: Technical service, technical development, technical consultation, technical exchange, technology transfer and technology promotion; Science and technology intermediary services; Information technology consulting services; Sales of petroleum products (excluding hazardous chemicals); Sales of deepwater oil drilling equipment; Sales of building materials; Sales of chemical products (excluding licensed chemical products); Sales of labor protection articles; Sales of metal wire rope and its products; Domestic trade agency; Import and export agent; Machinery and equipment leasing; General mechanical equipment installation services; Sales of offshore engineering equipment; Sales of teaching models and teaching aids; Sales of machinery and equipment; Sales of marine water quality and ecological environment monitoring instruments and equipment; Non residential real estate leasing; Ship leasing; Repair of special equipment; Retail of computer software, hardware and auxiliary equipment; Investing with its own funds; Repair of communication equipment; Computer and communication equipment leasing. (Except for the items that need to be approved according to law, business activities shall be carried out independently according to law with the business license) Permitted items: Ship repair; Construction works; Offshore oil exploitation; Residential interior decoration. (For projects that need to be approved according to law, business activities can only be carried out with the approval of relevant departments. The specific business projects shall be subject to the approval documents or permits of relevant departments. )