Technical service, technology development, technology consultation, technology exchange, technology transfer, technology popularization; Manufacture of special equipment for environmental protection; Sales of special equipment for environmental protection; General purpose component manufacturing; Machine parts, parts processing; Sales of machinery parts and spare parts; Distribution switch control equipment manufacturing; Distribution switch control equipment sales; Distribution switch control equipment research and development; Manufacturing of industrial automatic control systems; Industrial automatic control system device sales; Instrument manufacturing; Instrument sales; Manufacturing of plastic products; Sales of plastic products; Glass fiber reinforced plastic products manufacturing; Glass fiber reinforced plastic products sales; Machinery and equipment sales; General mechanical equipment installation services; General equipment repair; Special equipment repair; Electrical equipment repair; Mechanical and electrical equipment manufacturing; Mechanical and electrical equipment sales; Hardware wholesale; Hardware retail; Building materials sales; Electric wire and cable operation; Pump and vacuum equipment sales; Valve and cock sales; Fan and fan sales; Sales of metal products; Metal material sales; Sales of chemical products (excluding licensed chemical products); Rubber products sales; Sales of special chemical products (without dangerous chemicals); Environmental protection advisory services; Engineering and technology research and experimental development; New material technology research and development (except the projects subject to approval according to law, independently carry out business activities according to law with the business license