General items: sales of communication equipment; Sales of electronic products; Sales of mechanical equipment: sales of instruments and meters; Wholesale of electronic components; Sales of photovoltaic equipment and components; Display device sales: sales of pneumatic machinery and components; Optical cable sales; Sales of optical communication equipment; Sales of capacitors and supporting equipment; Special electronic equipment sales: battery sales; Computer equipment sales; Maintenance of household appliances; Retail of computer hardware, software, and auxiliary equipment: information system integration services: sales of refrigeration and air conditioning equipment; Sales of outdoor products; Manufacturing of refrigeration and air conditioning equipment; General mechanical equipment installation services; Maintenance of electronic and mechanical equipment (excluding special equipment): sales of intelligent power transmission and distribution and control equipment: sales of pumps and vacuum equipment; Sales of supplied instruments; Sales of generators and generator sets; Container sales; Technical services, technical development, technical consultation, technical exchange, technology transfer, and technology promotion; Import and export of goods; Technology import and export. (Except for projects that require approval according to law, independent business activities shall be carried out by virtue of the business license according to law.)