First I want to thank is raising my parents, they gave me the unselfish love, whenever I meet with difficulties, the parents are always the first to give me encouragement. I know that their study and life for my pay huge sacrifice and efforts, so far I've been without thought report, here only a token of my thoughts and their deeply grateful. I want to thank our roommate, and together they had hard to forget the wonderful time. In the process of writing papers, gives me many encourage and help.
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