毕业论文(设计)AcknowledgementsI would like to take this chance to express my gratitude to manypeople who have helped me with the completion of this paper.My sincere thanks and appreciation first of all go to Prof.LiWeihong,my supervisor,who has taken much time and troubleinstructing me in my paper.It has been a great privilege and joy towork under her guidance.Her valuable suggestions and unwaveringsupport have helped me overcome many difficulties.Without herinsightful criticisms and suggestions,the completion of this thesiswould be impossible.In addition,I deeply appreciate the contribution to this thesismade in various ways by my friends and classmates Ma Shuxiao andLan Huiliang.They gave me a lot of suggestions,provided somegood materials,and helped me to correct some errors or mistakes.i
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