R&D, production and sales of medical devices, air compressors, vacuum pumps, environmental protection equipment, disinfection products, electromechanical equipment, instrumentation and laboratory equipment; as well as R&D, production and sales of molds and spare parts related to the above products; providing technical consultation, technical services and technology transfer in the field of medical equipment and mechanical equipment; self-operating and acting as an agent for the import and export business of various commodities and technologies; leasing of its own houses. Retail sales of daily necessities; sales of labor protection products; sales of daily sundries; wholesale of cosmetics; retail sales of cosmetics; sales of sanitary products and disposable medical supplies; Internet sales (except for goods that require a license); sales of household appliances; manufacturing of household appliances; sales of electronic products; repair of daily appliances; retail of daily household appliances; professional cleaning, cleaning, and disinfection services; sales of disinfectants (excluding hazardous chemicals)