Construction engineering and construction; design of building intelligent systems; construction engineering design; electrical installation services (Operational projects subject to approval, in accordance with the approval results, specific business operations are subject to the approval results) General projects: technical services, technical development, technical consultation, technical exchange, technology transfer, technology promotion; information system operation and maintenance services; safety technology prevention system design and construction services; industrial design services; security system monitoring services; new material technology research and development; information system integration services; residential electrical and water installation and maintenance services; fire protection technical services; general machinery and equipment installation services; door and window sales; metal door and window construction; landscape engineering construction; distribution switch control equipment research and development; fire fighting equipment sales; security equipment sales; distribution switch control equipment sales; electronic product sales; high-performance non-ferrous metal and alloy materials sales; hardware retail; hardware wholesale; technical glass products sales; thermal insulation material sales; building decoration material sales; industrial automatic control system device sales; building material sales; metal material sales; functional glass and new optical material sales; glass fiber reinforced plastic products sales; plastic products sales; power generation technical services