Project supported by the National Natural Science Foundation of China(No.21462032);the Natural Science Foundation of Ningxia Hui Antonomous Region(No.NZ17001);the Discipline Project of Ningxia Hui Antonomous Region(No.NXYLXK2017A04);the Major Innovation Projects for Building First-class Universities in China's Western Region(No.ZKZD2017003);the Graduate Innovation of Ningxia University(No.GIP2018048)and the College Students’ Innovative and Entrepreneurship Training Program of Ningxia University(No.Q201710749028)~~