Installation (repair, testing) of electric facilities; installation and maintenance of mechanical and electrical equipment, lifting equipment, central air conditioning equipment (special equipment requires operation permit after safety supervision department approval); labor services; building engineering; rental of mechanical and electrical equipment; landscape gardening projects; road and water supply and drainage projects; construction management services; urban and road lighting projects; non-excavation road projects; wholesale and retail of hardware, electrical wires and cables, lighting equipment, communication equipment, building materials, cement products, metal materials, pipeline fittings, fire protection equipment and accessories; municipal public works; communication projects; foundation engineering; electronic and intelligent engineering; formwork and scaffolding projects; rental of engineering machinery and equipment.