Sales of ceramic raw materials, ceramic products, metal products, rubber products, ceramic molds, metal molds, grinding media, refractory materials, mechanical equipment (excluding passenger vehicles with nine seats or less) and their accessories, building materials, glass products, chemical products (excluding dangerous, monitored and precursor chemicals), textiles; Import and export of goods, import and export of technology. (For projects subject to approval in accordance with the law, business activities can only be carried out after approval by the relevant departments)