Road freight transport (excluding dangerous goods). General items: Research and development of power distribution switchgear equipment; Manufacture of power distribution switchgear equipment; Sales of power distribution switchgear equipment; Manufacture of power electronic components; Sales of power electronic components; Manufacture of electric motors; Manufacture of fans and blowers; Manufacture of refrigeration and air conditioning equipment; Sales of refrigeration and air conditioning equipment; Repair of general equipment; Manufacture of metal structures; Manufacture of railway locomotive and rolling stock parts; Manufacture of urban rail transit equipment; Labor services (excluding labor dispatch); Professional cleaning, washing, and disinfection services.