Other housing construction industry. Design and construction of construction engineering, steel structure engineering, municipal engineering, landscaping engineering, road engineering, bridge engineering, water conservancy engineering, electric power engineering, fire protection engineering, urban and road lighting engineering, pipeline installation engineering (excluding pressure pipeline), earthwork engineering, foundation and foundation engineering, indoor and outdoor decoration engineering; Sales of building materials, electrical equipment, fire-fighting equipment, security products, environmental protection products, hardware products, and general labor protection appliances; Labor subcontracting of construction projects (except for domestic labor dispatch); Project management; Engineering technical consultation; Engineering cost consultation; Import and export of goods or technologies