Import and export agency, sales of CNC machine tools; Sales of new metal functional materials; Wholesale of hardware products; Sales of photovoltaic equipment and components; Mold sales; Sales of mechanical parts and components; Repair of instruments and meters; Sales of power electronic components; Sales of electronic components and electromechanical component equipment; Sales of electrical and mechanical equipment; Domestic trade agency; Organize cultural and artistic exchange activities; Mechanical equipment leasing; Sales of artificial intelligence hardware; Sales of instruments and meters; Maintenance of electronic and mechanical equipment (excluding special equipment); Sales of metal products; Sales of metal tools;