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2005.7-Now
 School of Mathematics | Shandong University | Professor  | 在职 
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1998.7-2005.7
 School of Mathematics | Shandong University | Associate Professor 
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1991.7-1998.7
 School of Mathematics | Shandong University | Lecturer 
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1986.7-1991.7
 School of Mathematics | Shandong University