Refrigeration equipment and accessories, air conditioning equipment, electromechanical equipment and accessories, machinery and equipment and accessories, industrial automation control equipment, plumbing accessories, sales of refrigeration and freezing equipment, HVAC engineering, installation and maintenance of refrigeration equipment (excluding special equipment), installation of heating equipment, installation of ventilation equipment, installation of air conditioning equipment, indoor air purification projects, engineering for industrial automation control systems (excluding special equipment), engaged in the field of refrigeration equipment technology for technical development, technical consultation, and technical services. [As may be required by laws and regulations, the company's business operation is subject to relevant approval and filing.]