Time flies, four years of university life is about to come to an end. When the graduation thesis is about to be completed, I would like to take this opportunity to thank all the teachers and classmates who have helped me. I am very grateful to my supervisor, Mr. Jun Lu, for treating me for four years The cultivation of the thesis, from the selection of the thesis, the research of the thesis, to the revision of the thesis, to the final completion of the thesis, gave me a lot of careful guidance
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