国产成在线观看免费视频成本人,欧妇女乱妇女乱视频,亚洲欧美日韩一区在线观看,综合偷自拍亚洲乱中文字幕

Howshow Technology develops and manufactures a high-brightness light-energy small blackboard. The light-energy blackboard uses a bold yellow-colored font. Compared with the traditional blackboard using chalk, this kind of blackboard has better surface smoothness and small friction coefficient, so it is easy to write when writing, and the writing is completely revealed with only one stroke. Moreover, the high-brightness version of the blackboard is very bright, and the visible distance can reach 30-50 meters. It is widely used in various office places, classrooms, classrooms, training rooms, etc.

20-inch writing board can be placed in the home to do children's homework guidance board, graffiti board, teaching class, can also be applied to the store advertising display board, 57-inch blackboard is widely used in high-end conference rooms, training rooms, schools, to replace Traditional blackboards, whiteboards, green boards and various types of corkboards have broad market applications!