国产成人av区一区_日韩精品视频播放_爱豆传媒在线视频免费看电影_中文字幕AⅤ高清片_欧美老熟妇三级特黄午夜播_秋霞电影免费在线观看_桃子视频在线高清播放_碰碰欧美视频免费黄色一级_日韩经典亚洲专区_婷婷伊人色综合久久天天

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!