1. Study on NOx Emission Characteristics and Conversion Performance of a Hydrogen Engine Based on a Copper-Based Zeolite SCR Catalyst2. 某地区汽车与能源领域实习生3. 某市某机器人科技有限公司实习生4. Autonomous Vehicle Path Planning & Trajectory Tracking (Simulation) 5. Acoustic Metamaterial Structure with Nonlinear Stiffness