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/412851e3-34c7-4050-b0bb-ead8af33b3f2 Personal use only, all commercial or other reuse prohibited ljj雷竞技下载学报社科版. 2002 18(1): 1-3. article doi: ljj雷竞技下载学报社科版 18 1 http://bkds.ustb.edu.cn/article/id/412851e3-34c7-4050-b0bb-ead8af33b3f2 1 http://bkds.ustb.edu.cn/article/id/1e7b2562-fe97-46df-8cb1-3a4c9e522c74 Personal use only, all commercial or other reuse prohibited ljj雷竞技下载学报社科版. 2002 18(1): 4-7. article doi: ljj雷竞技下载学报社科版 18 1 http://bkds.ustb.edu.cn/article/id/1e7b2562-fe97-46df-8cb1-3a4c9e522c74 4 http://bkds.ustb.edu.cn/article/id/b4e5431d-d7b9-4362-a0e0-121e3ec16a88 Personal use only, all commercial or other reuse prohibited ljj雷竞技下载学报社科版. 2002 18(1): 8-14. article doi: ljj雷竞技下载学报社科版 18 1 http://bkds.ustb.edu.cn/article/id/b4e5431d-d7b9-4362-a0e0-121e3ec16a88 8 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