Permitted project: Construction engineering; Residential interior decoration; Electrical installation services; Construction engineering design; Surveying and mapping services; Manufacturing of special equipment; Installation, transformation and repair of special equipment; Installation, maintenance and test of power transmission, power supply and receiving facilities. (For projects that need to be approved according to law, business activities can only be carried out after being approved by the relevant departments. The specific business projects are subject to the approval documents or licenses of the relevant departments. ) General items: Special equipment repair; General equipment repair; General mechanical equipment installation services; Metal structure manufacturing; Foreign contracted projects; Import and export of goods; Machinery and equipment leasing; Energy conservation management services; Geological disaster management services; Ecological restoration and ecological protection services; Soil pollution control and remediation services; Electrical equipment repair; Technical service, technical development, technical consultation, technical exchange, technology transfer and technology promotion; Instrument repair; Park management services; General equipment manufacturing (excluding special equipment manufacturing); Manufacturing of special equipment (excluding manufacturing of licensed professional equipment); Manufacturing of forgings and powder metallurgy products; Measurement technology services.