A lot of people to thank the past year, thanks advisor and helped me all the people, especially to thank my parents always let me pursue whatever you want, but always supported, encouraged and sheltered me. In order to understand the real experience is not easy after only research, but also to better understand the contribution of each study is a precious cause every hard researchers. Finally, I would like to contribute to the case study we found that the company, without you, the paper will not be completed today, heartfelt thanks!
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