General project: Manufacturing of ordinary valves and plugs (excluding special equipment manufacturing); Sales of valves and plugs; Wholesale of hardware products; Retail of hardware products; Sales of synthetic materials; Manufacturing of ship automation, detection, and monitoring systems; Sales of photovoltaic equipment and components; Sales of rubber products; Installation services for ordinary mechanical equipment; Maintenance of electronic and mechanical equipment (excluding special equipment); Rubber product manufacturing; Research and development of hardware products; Packaging services; Import and export of goods. (Except for projects that require approval according to law, business activities can be carried out independently based on the business license in accordance with the law) Licensed project: Ship modification; Ship repair. (For projects that require approval by law, business activities can only be carried out after approval by relevant departments. The specific business projects shall be subject to the approval documents or licenses issued by the relevant departments. )