Technical consulting services for artificial intelligence public service platforms; Technical services, technology development, technology consulting, technology exchange, technology transfer, and technology promotion; Labor services (excluding labor dispatch); Mechanical equipment research and development; Sales of mechanical equipment; Sales of communication equipment; Sales of communication equipment; Internet equipment sales; Sales of distribution switch control equipment; Sales of optical communication equipment; Sales of instruments and meters; Sales of electronic products; Wholesale of hardware products; Retail of hardware products; Fiber optic sales; Fiber optic cable sales; Sales of power facilities and equipment; Mechanical equipment leasing;