Technical services, technology development, technical consultation, technology exchange, technology transfer, technology promotion; sales of lighting appliances; installation services of general mechanical equipment; sales of special equipment for the production of lighting appliances; sales of electrical equipment; retail of motorcycles and spare parts; sales of labor protection supplies; wholesale of stationery supplies Sales of stationery; retail of lubricants; sales of household appliances; retail of bicycles and spare parts; wholesale of bicycles and spare parts; sales of communication equipment; sales of knitted textiles; sales of sanitary ware; sales of office equipment; maintenance of electronic and mechanical equipment (excluding special equipment); general equipment repair Special equipment repair; Electrical equipment repair; Mechanical equipment leasing; Photovoltaic power generation equipment leasing; Mechanical and electrical equipment sales; Information technology consulting services; Food sales (only sales of prepackaged food); Class I medical device sales; Class II medical device sales; Import and export of goods; Import and export agents; Retail of computer software, hardware and auxiliary equipment; Wholesale of computer software, hardware and auxiliary equipment; Supply chain management services; Sales of electrical instruments and meters; Labor services (excluding labor dispatch); Motor vehicle repair and maintenance; Mechanical parts and components processing; Mechanical parts and components sales