Which is better, the blackboard, the green board or the whiteboard?
The classroom was originally dusty, you can not care, but other environments produce a lot of dust is not good! If you must use green and black suggestions can be used Youli optimal soft green board soft blackboard, chalk and liquid collocation Youli, will not produce dust!
The classroom can use blackboards, green boards, and other environments, such as conference rooms, with white boards. Because the blackboard, green board, ordinary environment can only chalk, it will produce a lot of dust.