General project: Sales of painting equipment; Manufacturing of painting equipment; Spray processing; Sales of specialized equipment for environmental protection; Sales of gas and liquid separation and purification equipment; Manufacturing of spray guns and similar equipment; Sales of ecological environment materials; Air pollution prevention and control services; Installation services for ordinary mechanical equipment; Sales of ovens, furnaces, and electric furnaces; Technical services, technology development, technology consulting, technology exchange, technology transfer, and technology promotion; Import and export of goods; Sales of refractory materials. (Except for projects that require approval according to law, conduct business activities independently based on the business license in accordance with the law)