Network technology services; Technical services, development, consultation, exchange, transfer, and promotion; Sales of electronic products; Retail of electronic components; Sales of communication equipment; Mold sales; Sales of mechanical parts and components; Sales of pneumatic power machinery and components; Research and development of mechanical equipment; Sales of metal tools; Sales of metal products; Wholesale of hardware products; Retail of hardware products; Sales of plastic products; Domestic trade agency; Internet sales (except for selling products that require licensing). (Except for projects that require approval in accordance with the law, business activities can be carried out independently with the business license in accordance with the law. ) The permitted business projects are: Import and export of goods. Projects that require approval in accordance with the law can only be operated with the approval of relevant departments. The specific business projects shall be subject to the approval documents or permits issued by relevant departments