Funding for this research was provided by:
Major entrustment projects of the Chongqing Bureau of quality and technology supervision (No.CQZJZD2018001)
Graduate Teaching Reform Research Program of Chongqing Municipal Education Commission (No.YJG183074)
Chongqing Social Science Planning Project (No.2018YBSH085)
Chongqing research and innovation project of graduate students (No.CYS18252, CYS19254)
Article History
Received: 18 July 2019
Revised: 18 April 2020
Accepted: 15 June 2020
First Online: 9 July 2020