"Synchronization" Teaching Aids in Wang Houxiong Teaching Aids Series. The so-called "synchronization" means one-to-one correspondence with textbooks and courses.

However, due to the different textbooks used in different places and published by different publishers, the complete textbook interpretation has also appeared in different versions. There are pinyin abbreviations on this cover to show the difference.

"People's Education Edition A" and "People's Education Edition B" are two different textbooks published by People's Education Publishing House, in which the curriculum or curriculum order is different. Therefore, the complete interpretation of teaching materials should correspond to it, which is naturally different. You can also understand that version A and version B of Complete Textbook are two different books.