General project: sales of instruments and meters; Wholesale of electronic components; Sales of ecological environment monitoring and testing instruments and meters; Sales of water quality pollutant monitoring and detection instruments and meters; Sales of air pollution monitoring and detection instruments and meters; Sales of advanced power electronic devices; Sales of marine water quality and ecological environment monitoring instruments and equipment; Sales of intelligent basic manufacturing equipment; Sales of mechanical equipment; Technical services, development, consultation, exchange, transfer, and promotion; Import and export of goods; Technology import and export; Domestic trade agency; Import and export agency; Sales of industrial automatic control system devices; Sales of intelligent instruments and meters; Sales of environmental monitoring specialized instruments and meters; Sales of environmental emergency testing instruments and meters (except for projects that require approval in accordance with the law, business activities shall be carried out independently based on the business license in accordance with the law).