LI Gui-Hua1**, ZHANG Xian-Jin2, HUANG Hua-Wen3, LIU Lei1
1. Jianning No.1 Middle School, Sanming 354500, China; 2. Institute of Chemical Education, Fujian Institute of Education, Fuzhou 350025, China; 3. Yong’an No.1 Middle School, Sanming 366000, China