I would like to extend my heartfelt thanks and high respect to teachers. My working attitude of striving for perfection and tireless teacher demeanor in the process of thesis design are the model of my lifelong learning, and I have given careful guidance and teaching from conception to finalization. In my study, I can finally complete the graduation thesis design. In the past three years, I have also received the care, support and help of many teachers! Finally, the instructors' profound and exquisite attainments and rigorous and realistic academic spirit. Here, the teacher's rigorous academic attitude and rich and profound knowledge will always inspire my keen academic thinking. I want to thank all the teachers who took time out of their busy schedules to review, comment and participate in my thesis defense. Teacher XXX chose a topic for this paper.