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Authors
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Funding
Funding for this research was provided by:
The Hebei Province Science and Technology Projects (18391501D, 18961031D)
The Hebei North University General Projects (YB2018032, YB2018026)
The Science and Technology Research project of Hebei's Colleges and University (BJ2017035)
The Science and Technology Research and Development Program of Hebei Province, Zhangjiakou city (17120011D)
The Doctoral Foundation of Hebei North University (220703)
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Article History
Received: 19 December 2018
Accepted: 13 March 2019
First Online: 19 March 2019
