Coating manufacturing (excluding hazardous chemicals), coating sales (excluding hazardous chemicals), electronic special material manufacturing, electronic special material sales, metal surface treatment and heat treatment processing, spray coating processing, rail transit engineering machinery and parts sales, railway locomotive and vehicle parts sales, marine supporting equipment manufacturing, mechanical and electrical equipment manufacturing, mechanical and electrical equipment sales, general mechanical equipment installation services, electrical equipment repair, foreign contracted projects, landscaping engineering construction, sewage treatment and reuse, water environment pollution prevention services, solid waste treatment, information system operation and maintenance services, import and export of goods, technical services, technical development, technical consulting, technical exchange, technology transfer, technology promotion.