Manufacturing of power electronic components; manufacturing of distribution switch control equipment; manufacturing of power facilities and equipment; manufacturing of mechanical and electrical equipment; manufacturing of transformers, rectifiers and inductors; manufacturing of ordinary valves and cocks (excluding manufacturing of special equipment); manufacturing of general equipment (excluding manufacturing of special equipment); repair of electrical equipment; sales of electrical equipment ; Sales of power electronic components; sales of mechanical and electrical equipment; sales of fire-fighting equipment; retail of motorcycles and spare parts; sales of instruments and meters; sales of distribution switch control equipment; wholesale of hardware products; sales of chemical products (excluding licensed chemical products); sales of building materials; manufacturing of daily necessities; sales of first-class medical devices Wholesale of cosmetics; sales of office supplies; sales of agricultural and sideline products; sales of valves and cocks; manufacturing of power transmission, distribution and control equipment; sales of metal structures; manufacturing of metal structures; sales of electrical accessories; manufacturing of electrical accessories; sales of metal materials; manufacturing of metal accessories for construction; manufacturing of metal products for safety and fire protection; non-residential premises Property leasing; housing leasing; instrument repair; hardware product manufacturing; wire and cable management; sales of electronic products; sales of electrical equipment; manufacturing of electrical equipment; sales of metal products; R&D of distribution switch control equipment; R&D of motors and their control systems; R&D of mechanical equipment; R&D of metal products; R&D of valves and cocks.