Funding for this research was provided by:
National Natural Science Foundation Project (41662010)
Xinjiang Uygur Autonomous Region University Scientific Research Program For Young Teachers Research And Cultivation Fund Project (XJEDU2016S038)
Article History
Received: 29 December 2017
Revised: 17 October 2018
Accepted: 30 November 2018
First Online: 7 January 2019