Content preview: This topic has been carefully guided by teacher * * in the process of topic selection and research. Teacher Lu asked me many times about the research process, pointed out the maze for me, helped me develop my research ideas, gave careful guidance and encouraged me enthusiastically. Teacher Lu's meticulous style, rigorous and realistic attitude and down-to-earth spirit not only taught me to be a man, but also taught me to be a man. Although it lasted for three years, it benefited me for life. Words can't express my gratitude to Teacher Lu. Thank * * teacher, * * teacher, * * teacher, * * teacher for my education and training. They carefully guide my study and research. Here, I want to bow deeply to all the teachers. Teachers such as * * Dean, * * Director of Science and Education Department, * * Secretary, * * Teacher and * * Teacher of Nanjing Xiaozhuang College have provided me with good research conditions. I would like to express my sincere respect and thanks to all my colleagues. Thank my classmates * *, * *, * * for their concern and help in my study and life in the past three years. Finally, I would like to thank my parents, my lover and my daughter for their understanding and …… /Article/ShowArticle.asp? ArticleID= 18959