Funding for this research was provided by:
Hebei Social Science Fund (HB17JY069)
Higher Education Reform and Research Projects in Hebei Province (2016GJJG117)
Hebei Postgraduate Demonstration Course (KCJSX2018068)
Hebei Social Science Fund (HB19JY017)
Article History
Received: 5 April 2019
Revised: 11 July 2019
First Online: 29 July 2019