Import and export agency; production of disinfection products for the prevention and control of infectious diseases; inspection and testing services; import and export of artworks; import and export of goods; technology import and export; import and export of medicines. General items: manufacturing of lighting fixtures; sales of lamps; sales of lighting fixtures; sales of electrical machinery and equipment; medical research and experimental development; manufacturing of semiconductor lighting devices; manufacturing of experimental analysis instruments; manufacturing of other general instruments; manufacturing of special instruments for environmental monitoring; sales of optical instruments; sales of special instruments for environmental monitoring; manufacturing of mechanical and electrical equipment ; Instrument manufacturing; Instrument sales; Instrument repair; Other special instrument manufacturing; Ecological environment monitoring and testing instrument manufacturing; Water quality pollutant monitoring and testing instrument manufacturing; Optical instrument manufacturing; Electronic component manufacturing; Special equipment manufacturing (excluding licensed professional equipment manufacturing); Class I medical device sales; Daily use masks (non-medical) production; Optoelectronic device sales; Daily necessities sales; Office equipment sales; Paper product sales; Office equipment consumable sales; Transportation and public management Sales of physical signs; manufacturing of arts and crafts and ceremonial items (except ivory and its products); sales of special chemical products (excluding hazardous chemicals); wholesale of stationery; sales of building decoration materials; sales of special equipment for environmental protection; wholesale of hardware products; manufacturing of special electronic equipment; wholesale of arts and crafts and collectibles (except ivory and its products); computer system services; wholesale of computer software, hardware and auxiliary equipment; software development; artificial intelligence application software development; information system integration services; technical services , technology development, technology consulting, technology exchange, technology transfer, technology promotion; optoelectronic device manufacturing; semiconductor lighting device sales; conference and exhibition services; daily necessities sales; daily ceramic products sales; Internet sales (except for the sale of goods that require licenses); daily household appliances retail; household appliance sales; household appliance spare parts sales; domestic trade agents; hardware product manufacturing; hardware product retail; plastic product sales; oil refining, chemical production special equipment manufacturing; oil refining, chemical production special equipment sales