R&D of machinery and equipment; Sales of industrial robots; Sales of specialized environmental protection equipment; Sales of water pollutant monitoring and testing instruments and meters; Sales of gas and liquid separation and purification equipment; Sales of thermal insulation materials; Sales of photovoltaic equipment and components; Sales of mechanical and electrical equipment; Sales of machinery and equipment; Sales of pumps and vacuum equipment; Sales of fans and blowers; Sales of mechanical parts and components; Sales of electrical equipment; Sales of charging piles; Sales of servo control mechanisms; Sales of batteries; Sales of plastic products; Sales of rubber products; Sales of metal products; Sales of chemical products (excluding licensed chemical products); Wholesale of hardware products; Sales of electronic products; Sales of electronic components and electromechanical assembly equipment; Sales of building materials; Sales of metal materials; Sales of labor protection supplies; Sales of instruments and meters; Technical services, technical development, technical consulting, technical exchanges, technology transfer, and technology promotion.