NIU Zheng-Zheng1, LIAO Zhi-Gang1*, HUANG Mei2*, DENG Yu2, LI Xiao-Feng3
1. College of Teacher Education,Harbin Normal University,Harbin 150025,China; 2. College of Teacher Education,Southwest University,Chongqing 400715,China; 3. College of Chemistry and Chemical Engineering,Harbin Normal University,Harbin 150025,China