Notice of Retraction“Three Center Three Level” exploration and practice of experimental teaching system

Learning ability of students and Technological innovation ability are important part of the deepening the reform of experimental teaching. Traditional “closed, verify that the type-based” teaching experiment seriously hinder the learning ability of students and technology innovation. In this paper, direct to problem in traditional teaching mode, explore and practice “Three Center Three Level”, The experimental teaching model is from “closed teaching ” to “open teaching ”, teaching content is from the “verify the theory-based” to “problem-based inquiry”, “Three Center and Three Level” teaching system results achieve good results.