1, based on the authority and professionalism, the graffiti textbooks have been carefully screened and audited to select high-quality textbooks. These textbooks are compiled by industry experts, professors and experienced teachers, including authoritative textbooks, comprehensive knowledge points and practical cases. Chalk will produce a lot of dust when it is used, which can easily fly into the air and then be inhaled into the lungs, posing a potential risk to health. Therefore, the painted textbooks are good.

2. The exercises in the graffiti textbook are designed to help students improve their ability to take exams. These exercises not only examine the mastery of basic knowledge, but also require students to use knowledge flexibly to solve practical problems. When writing with chalk, you need to use a blackboard or whiteboard, but in the environment of insufficient light, chalk writing will be blurred, which will bring trouble to students. Therefore, the painted textbooks are good.