General business items include: Sales and processing of hardware products and electronic products, sales and processing of plastic products, domestic trade, import and export of goods and technologies (except for projects that are subject to approval before registration as stipulated by laws, administrative regulations, and decisions of the State Council); New material research and development; Hardware product research and development; Automotive component research and development; Mechanical parts and component processing; Mechanical parts and component sales; Engineering and technical research and experimental development; Automotive component and accessory manufacturing; Sales of rail transit engineering machinery and components; Urban rail transit equipment manufacturing; Mechanical equipment research and development; Mechanical equipment sales; First-class medical device sales; Metal processing machinery manufacturing; Specialized equipment manufacturing (excluding licensed professional equipment manufacturing); Industrial engineering design services; Metal material manufacturing; Metal material sales; Sales of new metal functional materials. (Except for projects that require approval before registration, these businesses can be carried out independently in accordance with the business license), and the permitted business items are: Production of hardware products and electronic products.