http://bkds.ustb.edu.cn/ Journal of University of Science and Technology Beijing ( Social Sciences Edition) en 1008-2689 http://bkds.ustb.edu.cn/article/id/0ce45ad9-c18c-4805-b7b0-85bf09111384 Personal use only, all commercial or other reuse prohibited ljj雷竞技下载学报社科版. 2012 28(3): 1-9. article doi: ljj雷竞技下载学报社科版 28 3 http://bkds.ustb.edu.cn/article/id/0ce45ad9-c18c-4805-b7b0-85bf09111384 1 http://bkds.ustb.edu.cn/article/id/0cb35aa1-0b1f-4938-b86d-abec58a7c98c Personal use only, all commercial or other reuse prohibited ljj雷竞技下载学报社科版. 2012 28(3): 10-15. article doi: ljj雷竞技下载学报社科版 28 3 http://bkds.ustb.edu.cn/article/id/0cb35aa1-0b1f-4938-b86d-abec58a7c98c 10 http://bkds.ustb.edu.cn/article/id/22510c44-9a5e-4632-96e0-ccf68a0047d3 Personal use only, all commercial or other reuse prohibited ljj雷竞技下载学报社科版. 2012 28(3): 16-21. article doi: ljj雷竞技下载学报社科版 28 3 http://bkds.ustb.edu.cn/article/id/22510c44-9a5e-4632-96e0-ccf68a0047d3 16 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