Journal of Chaohu University ›› 2019, Vol. 21 ›› Issue (6): 133-139.doi: 10.12152/j.issn.1672-2868.2019.06.019
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1.SUN Ji-hong: Chinese National Institute of Educational Sciences, Beijing 100088;2.WANG Chuan-hui, ZHAO Xiao-yun:Department of Finance, School of Economics Qufu Normal University, Rizhao Shandong 276826