Manufacturing of special equipment (excluding manufacturing of licensed professional equipment); manufacturing of testing machines; sales of testing machines; manufacturing of experimental analysis instruments; sales of experimental analysis instruments; sales of ecological environment materials; manufacturing of ecological environment materials; manufacturing of new membrane materials; sales of new membrane materials; sales of instruments and meters; sales of electronic measuring instruments; sales of drawing, calculation and measuring instruments; sales of machine tool functional parts and accessories; wholesale of automobile parts; retail of automobile parts; retail of motorcycles and spare parts; wholesale of motorcycles and spare parts; mechanical parts, Sales of parts and components; wholesale of hardware products; retail of hardware products; sales of metal products; sales of wires and cables; sales of office equipment consumables; information technology consulting services; engineering and technology research and experimental development; technical services, technology development, technical consulting, technology exchanges, technology transfer, technology promotion; sales of machinery and equipment; leasing of machinery and equipment; sales of mechanical and electrical equipment; sales of electrical equipment; sales of electronic products; software development; software sales; general equipment manufacturing (excluding special equipment manufacturing); general equipment repair.