License Projects: Intelligent Building System Design; Construction Engineering; Construction Design; Residential Interior Decoration and Renovation; Construction Operations; Electrical Installation Services. (As required by laws and regulations, the scope of business shall be subject to the approval of relevant administrative departments, and the specific business scope shall be determined by the approved documents or permits issued by the relevant administrative departments.) General Projects: General Mechanical Equipment Installation Services; Sales of Gas and Liquid Separation and Purification Equipment; Sales of Environmental Protection Equipment; Sales of Fans and Blowers; Engineering Management Services; Engineering Technical Services (excluding planning management, surveying, design, and supervision); Sales of Mechanical Equipment; Sales of Building Decoration Materials; Sales of Refrigeration and Air Conditioning Equipment; Sales of Mechanical and Electrical Equipment; Manufacturing of Gas and Liquid Separation and Purification Equipment; Environmental Protection Monitoring; Sales of Electrical Equipment.