Big Ideas Teaching of “Material Composition” Based on Subject Understanding
LIU Jian1**, ZHENG Chang-Long2, KANG Bo1, NING Xiao-Qiang3
1. Middle School Attached to Northeast University, Changchun 130021, China;
2. Institute of Chemical Education, Northeast University, Changchun 130024, China;
3. Middle School Attached to Southwest University,Chongqing 400700,China
