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  2018, Vol. 0 Issue (5): 49-56    DOI:
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Research Technology,Industrial Practice and Prospect of Gradient Energy in China
Wang Yan1,2,Liu Bangfan3,Duan Xiaohong3
1.School of Economics and Management,Yanshan University,Qinhuangdao 066004,China;
2.School of Business Administration Hebei Normal University of Science and Technology,Qinhuangdao 066004,China;
3.School of Public Administration,Yanshan University,Qinhuangdao 066004,China;
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