Instrument manufacturing; instrument sales; mechanical and electrical equipment manufacturing; mechanical and electrical equipment sales; transformer, rectifier and inductor manufacturing; power electronic component manufacturing; power electronic component sales; electronic component manufacturing; electronic component wholesale; electronic component retail; electronics Research and development of special materials; sales of electronic special materials; manufacturing of power transmission and distribution monitoring and control equipment; sales of power transmission and distribution monitoring and control equipment; manufacturing of power transmission and distribution and control equipment; sales of intelligent power transmission and distribution and control equipment; research and development of power distribution switch control equipment; manufacturing of power distribution switch control equipment; power distribution switches Sales of control equipment; technical services, technology development, technical consulting, technology exchange, technology transfer, technology promotion; information system integration services; manufacturing of auto parts and accessories; wholesale of auto parts; retail of auto parts; motorcycle parts manufacturing; wholesale of motorcycles and parts; retail of motorcycles and parts; manufacturing of metal materials; sales of metal materials; industrial Internet data services; retail of computer software, hardware and auxiliary equipment; wholesale of computer software, hardware and auxiliary equipment; import and export of goods; sales of communication equipment; sales of chemical products (excluding licensed chemical products).