Acknowledgement. This research is supported by the National Natural Science Foundation of China under Grant No. 61572174, Hunan Province Special Funds of Central Government for Guiding Local Science and Technology Development No. 2018CT5001, the Scientific Research fund of Hengyang Normal University with Grant No. 16CXYZ01, the Science and Technology Plan Project of Hunan Province No. 2016TP1020, Hunan Provincial Natural Science Foundation of China with Grant No. 2017JJ4001, Hengyang Normal University Experiment Programs of Learning and Innovation for Undergraduates of China No. CX1808, CX1839, Hunan Provincial Experiment Programs of Learning and Innovation for Undergraduates of China with Grant No. 2018749, Subject group construction project of Hengyang Normal University No. 18XKQ02.