Software development; software sales; watch sales; furniture sales; battery sales; lamp sales; daily necessities sales; office supplies sales; office equipment sales; network equipment sales; electronic product sales; household appliance sales; audio equipment sales; display device sales; communication equipment sales; communication equipment sales; hardware product retail; security Sales of equipment; sales of needlework and textiles; sales of used cars; sales of daily necessities; sales of electrical equipment; sales of electrical equipment; sales of mechanical equipment; sales of fire-fighting equipment; sales of metal products; sales of Internet equipment; sales of electric bicycles; sales of furniture spare parts; sales of motor vehicle charging; sales of office equipment consumables; information security equipment Sales; sales of household audio-visual equipment; sales of cameras and equipment; sales of mobile communication equipment; sales of terminal measurement equipment; sales of special packaging equipment; sales of household appliances spare parts; sales of refrigeration and air-conditioning equipment; sales of first-class medical devices; sales of second-class medical devices; sales of amusement and entertainment supplies; sales of new energy vehicles; Sales of mechanical parts and components; sales of new energy vehicle electrical accessories; sales of distribution switch control equipment; sales of industrial control computers and systems; sales of new energy vehicle production and testing equipment; sales of electronic components and electromechanical component equipment; sales of sanitary products and disposable medical supplies; retail of shoes and hats; retail of musical instruments; retail of clothing and apparel; Retail of stationery; retail of daily household appliances; retail of medical masks; retail of electronic components; retail of motorcycles and spare parts; retail of sporting goods and equipment; retail of bicycles and spare parts; retail of photographic equipment and telescopes; retail of kitchenware, sanitary ware and daily sundries; retail of computer software, hardware and auxiliary equipment; metering services; integrated circuit design; Data processing services; computer system services; Internet security services; building cleaning services; home appliance installation services; information technology consulting services; information system integration services; office equipment rental services; data processing and storage support services; network and information security software development; security technology prevention system design and construction services; communications Equipment repair; Daily appliance repair; Daily product repair; General equipment repair; Instrument repair; Musical instrument repair and debugging; Electric bicycle repair; Motor vehicle repair and maintenance; Professional repair of communication switching equipment; Professional repair of communication transmission equipment; Computer and office equipment repair; Professional repair of radar and radio navigation equipment; Medical care Equipment leasing; Mechanical equipment leasing; Computer and communication equipment leasing; Internet sales (except for the sale of goods requiring licenses); Recycling and wholesale of recycled materials; Recycling of renewable resources (except productive scrap metal); Category III medical device operations; Category I value-added telecommunications business; Category II value-added telecommunications business; Treatment of waste electrical and electronic products;