This paper was completed under the kind care and careful guidance of teacher XXX. His serious scientific attitude, rigorous academic spirit and work style of Excellence deeply infected and inspired me. * The teacher not only gave me careful guidance in my study, but also gave me meticulous care in my thoughts and life. Sincere thanks and high respect to teacher XXX. I also want to thank the students who spent the graduation thesis group happily together. ...

2.

The three-year study in the university is coming to an end. I want to express my heartfelt thanks to my alma mater, my parents, my relatives, my teachers and my classmates. Thank my family for their silent support for my three-year study in college. Thank my alma mater, * * *, for giving me the opportunity to study in the university for three years, so that I can continue to learn and improve; Thank * * * teachers and students for their concern and encouragement in the past three years. Teachers are passionate in class and inculcate in class; Students' learning enthusiasm and health ...

3.

When I look back on the past years, I feel very full. When I finished writing this graduation thesis, I felt a sense of relief and a lot of feelings. First of all, I sincerely thank my thesis advisor * *, who took time out of her busy schedule to review and revise my thesis. And all the teachers who have taught me, your rigorous and meticulous style has always been an example in my work and study. Their persuasive teachings and eclectic ideas gave me nothing. ...