In the process of this paper design, thanks to the school, teachers and students who have given me the opportunity and help, it is the school that has given me a valuable opportunity to learn. In the process of writing, it is teacher Xue Weijun who has given me careful guidance and put forward a lot of valuable ideas and suggestions in the process of paper writing My working style and enterprising spirit have an important influence on me. This paper was completed under the careful guidance and strong support of the teacher.<br>In addition, I would like to thank all the teachers who have taught me their profession. Without the accumulation of knowledge over the years, I do not have such great motivation and confidence to complete this paper. In addition to being grateful, I sincerely ask all teachers to criticize and correct my thesis, so that I can improve the shortcomings of my thesis in time.<br>Finally, I would like to express my heartfelt thanks to all the teachers who have taken time out of their busy schedule to review this article.<br>
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