TANG Tian-Wei1,2, WANG Lei1,2,3**, WEI Rui1,2, HU Jiu-Hua1,2
1. College of Chemistry, Beijing Normal University, Beijing 100875, China; 2. National Research Institute for Teaching Materials for Chemistry at Primary and Secondary School, Beijing 100875, China; 3. Faculty of Arts and Science, Beijing Normal University, Zhuhai 519087, China