WANG Wen-Ting1, LIU Zi-Zhong1*, ZHANG Feng-Ying2, XIANG Hong3
1. College of Chemistry and Environmental Sciences,Inner Mongolia Normal University,Hohhot 010020,China; 2. College of Education,Inner Mongolia Normal University,Hohhot 010020,China; 3. Inner Mongolia Xilinhot No.6 Middle School,Xilinhot 026000,China