Production of Class II medical devices; import and export of goods; import and export of technology; import and export agency general items: bio-based material technology research and development; technical services, technology development, technical consultation, technology exchange, technology transfer, technology promotion; sales of Class II medical devices; production of Class I medical devices; sales of Class I medical devices; retail of protective equipment for medical staff; domestic trade agency Management; software development; sales of office equipment; sales of electronic products; sales of instruments and meters; sales of optoelectronic devices; sales of optical instruments; repair of daily appliances; sales of refrigeration and air-conditioning equipment; sales of intelligent instruments; sales of household appliances; research and development of household appliances; retail of daily household appliances; retail of electronic components; electrical equipment repair; special equipment repair; general equipment repair