LIU Shuai1, ZOU Guo-Hua2, DENG Yang3, WANG Long4**
1. Wanjiang Middle School,Dongguan 523000,China;
2. Longyan No.1 Middle School,Longyan 364000,China;
3. Institute of Chemistry Education, Central China Normal University,Wuhan 430079,China;
4. China Three Gorges University,Yichang 443000,China