GAO Jun1, WANG Fei-Fei2**, CHEN Peng3, DU Hua4, LIAO Zhi-Gang1
1. College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin 150025, China; 2. Harbin University, Harbin 150076, China; 3. Baotou No.4 Middle School,Baotou 014030,China; 4. College of Teacher Education, Harbin Normal University, Harbin 150025, China