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Funding
Funding for this research was provided by:
the Outstanding Youth Project of the Department of Education of Hunan Province (16B049)
the Natural Science Foundation of Hunan Province (2017JJ2020)
the Science and Technology Projects of Yiyang (2015JZ26)
the Science and technology program of education department of hunan province (15C0260, 16C0303)
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Article History
Received: 31 October 2018
Accepted: 16 May 2019
First Online: 29 May 2019
