Retail of electronic components; Sales of electronic products; Wire and cable business; Cable sales; Instrument sales; Electrical equipment sales; Electronic materials research and development; Metal material sales; Plastic products sales; Hardware product research and development; Sales of electronic measuring instruments; Sales of power electronic components; Sales of electronic components and electromechanical components; Sales of electronic special equipment; High performance sealing material sales; Sealing filler sales; Electrical accessories sales; Fastener sales; Office supplies sales; Sales of daily provisions; Sales of labor protection articles; Sales of chemical products (excluding licensed chemical products); Motor and control system research and development; Distribution switch control equipment development; Technical services, technology development, technology consultation, technology exchange, technology transfer and technology popularization (except for projects subject to approval according to law, independently carry out business activities according to law with business license)