Engineering technology development, service, consultation, transfer; Engineering project management; Sales of fire fighting equipment and equipment, building materials, communication equipment (excluding satellite ground receiving and launching equipment), safety technology products, chemical products (excluding hazardous chemicals, a class of precursor chemicals), electronic products, cultural articles public security equipment: Mechanical and electrical equipment, river washing equipment, instruments and meters. Research and development, design and maintenance of repair equipment, gas equipment and engineering automation system; Technology import and export; Professional contracting. (Enterprises import and export goods, import and export agents, independent selection of business projects in accordance with the law, to carry out business activities; For projects subject to approval according to law, business activities shall be carried out in accordance with the approved contents after approval by relevant departments; They shall not engage in business activities of items prohibited or restricted by this Municipality's industrial policies.