1. Urea suppliers: Urea suppliers can cooperate with automobile manufacturers and automobile dealers. Provide urea products and technical support for vehicles. They can provide urea solution that meets the quality standards and ensure its stability and purity meet the requirements.

2. Supplier of exhaust gas treatment system: The supplier of exhaust gas treatment system can cooperate with the supplier of urea for vehicles to develop and produce SCR (Selective Catalytic Reduction) system suitable for diesel vehicles. These systems use vehicle urea to reduce NOx emissions in exhaust gas.

3. Fuel suppliers: Fuel suppliers can cooperate with automotive urea suppliers to jointly promote the popularization of automotive urea technology in diesel vehicles. They can provide low-sulfur fuel that meets the standard to ensure the effectiveness of urea for vehicles in SCR system.