Manufacturing of photovoltaic equipment and components; research and development of mechanical equipment; sales of photovoltaic equipment and components; manufacturing of special equipment for environmental protection; sales of special equipment for environmental protection; manufacturing of motorcycle parts and accessories; research and development of motorcycles and parts; wholesale of motorcycles and parts; manufacturing of auto parts and accessories; research and development of auto parts; wholesale of auto parts; mechanical parts and parts processing; sales of mechanical parts and parts; general parts manufacturing; metal surface treatment and heat treatment processing; import and export of goods; import and export of technology.