General project: General equipment manufacturing (excluding special equipment manufacturing); Specialized equipment manufacturing (excluding licensed professional equipment manufacturing); Manufacturing of specialized equipment for refining and chemical production; Sales of specialized equipment for refining and chemical production; Sales of mechanical equipment; Metal cutting services; Manufacturing of refrigeration and air conditioning equipment; Sales of refrigeration and air conditioning equipment; Rubber product manufacturing; Sales of rubber products; Mold manufacturing; Mold sales; Steel rolling processing; Sales of metal structures; Sales of metal materials; Sales of metal products; Installation services for ordinary mechanical equipment; General equipment repair; Special equipment repair; Technical services, technology development, technology consulting, technology exchange, technology transfer, and technology promotion; Import and export agency; Technology import and export (except for projects that require approval according to law, business activities can be conducted independently based on the business license in accordance with the law)