LIU Qiu-Fang1, ZHANG Yu-Fang2, YE Yong-Qian3**, ZHANG Xian-Jin3
1. No.6 Middle School in Datian County, Datian 366100,China; 2. No.5 Middle School in Datian County, Datian 366100,China; 3. Institute of Chemical Education, Fujian Institute of Education, Fuzhou 350025, China