1. Accuracy principle. Some people call it a scientific principle. This is the most basic principle, no matter what teaching materials are compiled, we must follow this principle. Because the textbook has lost its accuracy, it is not correct. If the content of the textbook is incorrect, it will lose its qualification as a textbook.

2.

Mature principle. In principle, the contents selected into the basic textbooks, especially some basic concepts, theories and methods, should be relatively mature at present, and only those with similar views are suitable for entering the textbooks.