Luke Edition Elective (3-4) Chapter 6, Sections 3 and 4 "Preliminary of General Relativity" ppt course standard positioning learning objectives: 1. Preliminary understanding of several main points of general relativity and main observation evidence. 2. Pay attention to the new developments in the study of the universe, and realize that human knowledge of nature is constantly expanding. 3. Understand the difference between the principle of narrow relativity and the principle of general relativity. Key points and difficulties: 1. The basic principle and space-time structure of general relativity. 2. Experiment of general relativity.

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