毕业论文（设计）AcknowledgementsOne must be indebted to many people for various kinds of help andsupport in a study like this.I am most grateful to Ms.Zheng Sanliang,whoinspired and encouraged me with her enlightening ideas and insightfulremarks.Thanks for her continuous supports and comments in my writing ofthis dissertation.I am extremely grateful to the reference room of our department and thelibrary of our university and the computer room,which have providedvarious reading publications and materials relevant to my study.My specialthanks to my friend Kevin,who has given me many helps to collect thevaluable materials and the drawings on this paper.i
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