1. The revision scope is different. For example, there are many series of teaching AIDS in Wang Houxiong, and different series will be modified to varying degrees. For example, the textbook "Complete Solution of Learning Plans" may be changed with new topics, and the complete solution of NMET learning plans, complete solution of NMET learning plans, complete solution of NMET learning plans and complete solution of NMET learning plans may be greatly revised, and the complete solution of classroom learning plans may be greatly adjusted or even changed in format.
2. The influence of changes in teaching materials. If the textbook changes, whether it is a series of major repairs or minor repairs, Wang Houxiong Books will make corresponding adjustments or even complete changes according to the textbook.
So please choose the latest version when buying, so as not to affect the learning effect.