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What is "Senior High School Mathematics: Compulsory 2 (Teaching Experiment A Edition)"
High school textbooks are divided into compulsory courses and elective courses. Compulsory courses must be learned. Every time you finish reading a book, you get corresponding credits. High school must take enough credits to graduate. Elective courses are usually taken by students after the teacher has chosen them. At the end of the comprehensive examination paper, you should choose to do the problem, and the knowledge of the topic selection is the content of the selected test.