Cao, Jianqin
Liu, Quanying
Li, Yang
Yang, Jun
Gu, Ruolei
Liang, Jin
Qi, Yanyan
Wu, Haiyan
Liu, Xun
Funding for this research was provided by:
Heilongjiang province social science fund (15EDBO3)
Heilongjiang province social science fund project (16EDC03)
Ministry of education of humanities and social science fund project (16YJCZH002, 13YJCZH093)
Daqing city technology bureau guidance project (szdy-2015-04)
Article History
Received: 13 April 2017
Accepted: 17 July 2017
First Online: 28 July 2017