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onsiderations and great confidence in me all through these years. i also owe my sincere gratitude to my friends and my fellow classmates who gave me their help and time in listening to me and helping me work out my problems during the difficult course of the thesis. 在本論文的寫作過程中,我的導師***老師傾注了大量的心血,從選題到開題報告,從寫作提綱,到一遍又一遍地指出每稿中的具體問題,嚴格把關,循循善誘,在此我表示衷心感謝。同時我還要感謝在我學習期間給我極大關心和支持