General equipment manufacturing (excluding special equipment manufacturing); general equipment repair; general parts manufacturing; mechanical equipment research and development; mechanical equipment sales; special equipment manufacturing (excluding licensed professional equipment manufacturing); special equipment repair; textile special equipment manufacturing; textile special equipment sales; mechanical parts and component processing; mechanical parts and component sales; electronic and mechanical equipment maintenance (not included) Including special equipment); mechanical and electrical equipment manufacturing; mechanical and electrical equipment sales; auto parts wholesale; auto parts retail; auto parts research and development; auto parts and accessories manufacturing; motorcycle parts manufacturing; motorcycles and parts wholesale; motorcycles and parts retail; motorcycles and parts research and development; import and export of goods; technology import and export; manufacturing of plastic products; sales of plastic products.