The writing board has the function of multi-purpose, including projection function and dust-free writing. It is mainly used for teaching.Generally, the thickness of the writing board is about 0.2mm. Five layers of special materials are synthesized by high-tech methods. The five qualities are integrated into one, which makes the writing board possess distinctive characteristics. Its reflectance ratio pThe projection screen is increased by 20%, which makes the image brighter and clearer, significantly improves the projection brightness, and avoids the trouble of turning off lights and closing Windows. Comprehensive elimination of dust, ringKeep healthy, handwriting clearer, writing more smoothly. Preset grid writing surface, without the help of tools, at hand can face beautiful tables and graphics.A notebook, "notebook," in everyday life, means a small book you use to keep track of things. In the narrow sense, it refers to a lined book, in the broad sense, a pamphlet used for recording.A pamphlet used to record things. In the absence of writing, human beings used to record numbers or events, express a certain meaning, in order to convey information. It can be seen from the paintings of the primitive society in the net pattern, the rope pattern on the pottery and the pottery net pendant, etc., that the rope recording (counting) was one of the records widely used by the primitive ancestors. Notepad can not only record time, just like the ancient people (knot rope to remember), but also spread culture, because of life and gradually rough heart.This notebook is divided into a variety of cover materials, leather, imitation leather PU, leather, PP, cloth and metal. Binding form: paperback notebook, loose leaf notebook, ring notebook, hardcover notebook, electronic notebook, etc.The book, pronounced běn zi, refers to the book; The record book, which records things or notes, is a tool for modern students to write homework. In THE BOOK OF ZhuZI Language, Vol. 14: "At first sight, we must use this book. I know it is harmful, and it is useless."1. The books."Zhuzi LANGUAGE CLASS" Vol. 14: "AT first sight, we must use this book. I know it is harmful, and it is useless."2. A book bound in stacks of paper.The third and fourth chapter of The Confucian Scholar: "' My younger brother has been running around for many days for the Taibo temple, and now he has a little idea of the scale. I took a book out of my sleeve and handed it over." Such as: notebook; Book instead.3. The script.Qing Jiang Shiquan "Dream of Linchuan · Flower Qing" : "Yesterday I saw a book from Suzhou. I don't know who deleted and revised your" Peony Pavilion "a lot."4. Refer to the book version.