Blackboards have different applications and different sizes

Many people pay more attention to the price when buying a blackboard. In fact, the prices of our blackboards of different sizes are different. They cannot be measured only by price. After all, the functions are different. What are the different sizes of blackboards on the market? What? When designing the blackboard, it is required to comply with such regulations
①The size and height of the blackboard should not be less than 0 for primary schools and no less than 0 for middle schools
②The vertical distance between the lower edge of the blackboard and the podium surface should be 0 for primary schools. The middle school should be outside, and the surface of the blackboard should be made of wear-resistant and matte materials
③The horizontal distance between the two ends of the podium and the edge of the blackboard should not be less than, the width should not be less than, and the height should be
In this way, with Comparing actual sizes will make your selection more convenient and avoid wasting money