2、毕业论文是在指导教师薛梅的指导下独立撰写完成的。如有剽窃、抄袭、造假等违反学术道德、学术规范和侵权的行为,本人愿意承担由此产生的各种后果,直至法律责任,并愿意通过网络接受公众的监督。特此郑重声明。 毕业论文作者:年月日AcknowledgementsI am glad to express my gratitude. First of all, I would like toextendmymostsinceregratitudetomyteacherXueMei,forherconstantencour
3、agementandguidance.Shehaswalkedmethroughallthestagesofthewritingofthisthesis.Inthisperiodshehasgivenmemuchadvicesandusefulsuggestionsonmythesis.Ithankherforgenerouslysharingherknowledgeandtime,forbeingpatientwithmyquestions.The research in this article would not have bee
4、n possible without her help. Iamalsothankfultootherprofessors,whohavetaughtmeandenlightenedmewiththeirinstructivelectures.What’smore,Iamalsothankfultomyclassmates,especiallymyroommateswhohaveofferedmuchhelp.Andtheyhaveprovidedmewithreferencematerialsofgreatvalue.Lastmyth