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Physics textbooks use physics terms to represent physics knowledge, and the network of knowledge formed by physics terms reflects its internal relation. For comparison purposes we present the “sound and light” part of the physics textbook of China and America on the knowledge network. We use complex network method to analyze the difference and similarity of knowledge networks. The results we obtained demonstrate that the closeness of the textbook knowledge in America is even higher. In our research, it is to be of great significance for providing a new way of comparing textbooks. Keywords—junior middle school; physics textbooks; knowledge network; complex network

A Comparison of Knowledge Network in Junior Middle School Physics Textbooks between Chinese and American--Take qSound and Lightq for an Example