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诚信宣言我，王冬霞，郑重宣布：除了参考文献所标明引用的资料和内容之外，本论文中不包含有任何已经被其他高等教育机构所接受的学位或学历论文资料，也不包含有其他任何人已经正式出版的资料内容。签字：日期：DeclarationI,Wang Dongxia,hereby declare that this document embodies the resultsof my own work and that it has been composed by myself.Following normalacademic conventions,I have made due acknowledgement of the work of others.I am fully aware of the legal consequences of this statement.Signed:Date:已经在导师的指导下进行多次修改，导师已同意提交定稿。导师签名：日期：