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/345887c9-876b-4465-be5c-6912b7efaee9 Personal use only, all commercial or other reuse prohibited ljj雷竞技下载学报社科版. 2004 20(3): 1-5. article doi: ljj雷竞技下载学报社科版 20 3 http://bkds.ustb.edu.cn/article/id/345887c9-876b-4465-be5c-6912b7efaee9 1 http://bkds.ustb.edu.cn/article/id/a6149483-7c33-4533-94d1-50865633ce8c Personal use only, all commercial or other reuse prohibited ljj雷竞技下载学报社科版. 2004 20(3): 6-9. article doi: ljj雷竞技下载学报社科版 20 3 http://bkds.ustb.edu.cn/article/id/a6149483-7c33-4533-94d1-50865633ce8c 6 http://bkds.ustb.edu.cn/article/id/5accc180-c028-4640-a775-9ece3187ccd6 Personal use only, all commercial or other reuse prohibited ljj雷竞技下载学报社科版. 2004 20(3): 10-13. article doi: ljj雷竞技下载学报社科版 20 3 http://bkds.ustb.edu.cn/article/id/5accc180-c028-4640-a775-9ece3187ccd6 10 http://bkds.ustb.edu.cn/article/id/4c411247-cbd8-48fe-88cf-215cd077f04a Personal use only, all commercial or other reuse prohibited ljj雷竞技下载学报社科版. 2004 20(3): 14-17,22. article doi: ljj雷竞技下载学报社科版 20 3 http://bkds.ustb.edu.cn/article/id/4c411247-cbd8-48fe-88cf-215cd077f04a 14 http://bkds.ustb.edu.cn/article/id/1be94be7-cb1a-4a50-a3e4-eff27b63b840 Personal use only, all commercial or other reuse prohibited ljj雷竞技下载学报社科版. 2004 20(3): 18-22. article doi: ljj雷竞技下载学报社科版 20 3 http://bkds.ustb.edu.cn/article/id/1be94be7-cb1a-4a50-a3e4-eff27b63b840 18 http://bkds.ustb.edu.cn/article/id/17fc6f1f-ad97-47f4-b4a6-27d15b74b257 Personal use only, all commercial or other reuse prohibited ljj雷竞技下载学报社科版. 2004 20(3): 23-27. article doi: ljj雷竞技下载学报社科版 20 3 http://bkds.ustb.edu.cn/article/id/17fc6f1f-ad97-47f4-b4a6-27d15b74b257 23 http://bkds.ustb.edu.cn/article/id/741ae576-3dbd-4335-b2b5-ab6c1a1e261f Personal use only, all commercial or other reuse prohibited ljj雷竞技下载学报社科版. 2004 20(3): 28-36. article doi: 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