Zhou ting ting, represented by legal persons, has a general project: technical services, technology development, technical advice, technical exchange, technology transfer, technology diffusion; sale of hydraulic machinery and components; sale of gas-powered machinery and components; sale of pumps and vacuum equipment; sale of valves and rotor stows; research and development of valves and cyclones; sale of machinery equipment; sale of electrical machinery equipment; sale of electronics; sale of rubber products; sale of plastics; sale of instrument instruments; distribution of five gold products (in addition to legally authorized projects)