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On the Hike of Repayment Rate in National Student-aid Loan
xu si-jie1; qiao zhen-zhen2; yang zi-yi3; tian yang1(1.graduate school; southwest jiaotong university; chengdu 610031; sichuan; china; 2.school of humanities and social sciences; southwest jiaotong university; chengdu 610031; china; 3.school of information science and technology; southwest jiaotong university; chengdu 610031; china)
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