毕业论文（设计）AcknowledgementsMy deepest gratitude goes first and foremost to my tutor,MissZheng Sanliang,for her constant encouragement and guidance.Shehas walked me through all the stages of the writing of this thesis.Without her consistent and illuminating instruction,this thesis couldnot have reached its present form.Last my thanks would go to my beloved family for their lovingconsiderations and great confidence in me all through these years.Ialso owe my sincere gratitude to my friends and my fellowclassmates who gave me their help and time in listening to me andhelping me work out my problems during the difficult course of thethesis.i
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