Installation and maintenance of gas burning appliances; sales of disinfection equipment. General items: manufacturing of metal daily necessities; manufacturing of special equipment (excluding manufacturing of licensed professional equipment); manufacturing of special equipment for environmental protection; manufacturing of special equipment for commerce, catering, and services; manufacturing of non-electric household appliances; manufacturing of glass fiber reinforced plastic products; manufacturing of glass, ceramics and enamel Manufacturing of special equipment for product production; wholesale of kitchenware, sanitary ware and daily sundries; retail of kitchenware, sanitary ware and daily sundries; sales of daily necessities; sales of daily ceramic products; sales of daily necessities; research and development of kitchenware, sanitary ware and daily sundries; sales of household appliances; retail of daily household appliances; tea set sales; furniture installation and Maintenance services; production of gas appliances; centralized disinfection services for catering appliances; sales of special equipment for the production of lighting appliances; repair of metal products; repair of household appliances; repair of general equipment; air pollution prevention and control services; water environment pollution prevention and control services; sales of special equipment for environmental protection; sales of environmental emergency technical equipment; sales of gas, liquid separation and purification equipment; sales of special instruments and meters for environmental monitoring; sales of building decoration materials; sales of metal structures; sales of metal products; manufacturing of glass instruments; sales of glass instruments; manufacturing of daily glass products; sales of daily glass products; home Sales of household products; sales of furniture; sales of plastic products; sales of glass fiber reinforced plastic products; sales of machinery and equipment; sales of building materials; sales of lightweight building materials; sales of chemical products (excluding licensed chemical products); sales of metal materials; sales of new metal functional materials; sales of refrigeration and air-conditioning equipment; sales of electronic components and electromechanical components; sales of security equipment; sales of digital video surveillance systems; sales of network equipment; manufacturing of general equipment (excluding manufacturing of special equipment); wholesale of sporting goods and equipment; sales of special instruments for teaching; sales of teaching models and teaching aids Sales; sales of furniture spare parts; sales of fire-fighting equipment; sales of household appliance spare parts; household appliance installation services; sales of mechanical and electrical equipment; sales of non-electric household appliances; sales of electric heating food processing equipment; wholesale of hardware products; sales of signs for transportation and public administration; sales of needlework and textiles Sales; domestic waste treatment equipment sales; leasing services (excluding licensed leasing services); non-residential real estate leasing; professional design services; metal product research and development; residential water and electricity installation and maintenance services; technical services, technology development, technical consultation, technology exchange, technology transfer, and technology promotion.