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/6a024dfc-5c02-48f8-9e01-3d4c7c5aa711 Personal use only, all commercial or other reuse prohibited ljj雷竞技下载学报社科版. 2003 19(1): 1-6,51. article doi: ljj雷竞技下载学报社科版 19 1 http://bkds.ustb.edu.cn/article/id/6a024dfc-5c02-48f8-9e01-3d4c7c5aa711 1 http://bkds.ustb.edu.cn/article/id/1be8c98c-96db-4494-a462-4a5f765b1e1e Personal use only, all commercial or other reuse prohibited ljj雷竞技下载学报社科版. 2003 19(1): 7-9. article doi: ljj雷竞技下载学报社科版 19 1 http://bkds.ustb.edu.cn/article/id/1be8c98c-96db-4494-a462-4a5f765b1e1e 7 http://bkds.ustb.edu.cn/article/id/22bc36be-f15a-433f-8f07-297db18f18b9 Personal use only, all commercial or other reuse prohibited ljj雷竞技下载学报社科版. 2003 19(1): 10-16. article doi: ljj雷竞技下载学报社科版 19 1 http://bkds.ustb.edu.cn/article/id/22bc36be-f15a-433f-8f07-297db18f18b9 10 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