Funding for this research was provided by:
Foundation of Hebei University of Science and Technology (2019-ZDB02)
Key projects of Humanities and Social Sciences in Colleges and universities of Hebei Province (SD201010)
Soft science special project of Hebei Province innovation ability improvement program (205576142D)
Article History
Received: 29 August 2020
Accepted: 11 November 2020
First Online: 24 November 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.