首先，我要感谢我的指导老师对我的教导。从论文的选题、构思、撰写到最终的

First of all, I want to thank my instructor taught me. From the research subjects, ideas, write to the final finalized, the instructor gave me careful guidance and enthusiasm to help, so that I can successfully complete the dissertation. Instructor job seriously, the spirit of academic research and rigorous study, are worthy of my life-long learning.

First of all, I would like to thank my instructor for teaching me. From the selection of the thesis, conception, writing to the final version, the guidance teachers have given me careful guidance and enthusiastic help, so that my graduation thesis can be successfully completed. The teacher's serious responsibility to the work, the academic spirit of study and rigorous learning style, are worthy of my lifelong study.

First of all, I want to thank my tutor for teaching me. From the topic selection, conception, writing to the final draft of the thesis, the instructor gave me careful guidance and enthusiastic help, so that my graduation thesis can be successfully completed. It's worth learning all my life that the instructor is responsible for his work, the spirit of academic research and rigorous style of study.