Funding for this research was provided by:
Research and Development Project of Basic Research Business Fees of Provincial Higher Education Institutions in Heilongjiang Province in 2018 (No. YSTSXK201870, No. YSTSXK201871)
Qiqihar University College Students Innovation and Entrepreneurship Training Program (No. 201910232049)
National Natural Science Foundation of China (No. 51303087)
Natural Science Foundation of Heilongjiang Province (No. QC2015057)
Fundamental Research Funds in Heilongjiang Provincial Universities (No. 135309110)
Article History
Received: 18 March 2020
Accepted: 26 May 2020
First Online: 2 June 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict to interest.