1. Principle It removes handwriting by absorbing graphite. This kind of eraser can not only erase handwriting (in fact, it can accurately remove handwriting), it can also be used to highlight important parts or make the work more detailed. However, it is not good at removing large areas of handwriting, and it will stain or…
1. There are two types of workbooks on paper: ordinary type and eye protection type; 2. There are four types of homework books: Chinese grid books, mathematics grid books, English four-line grid books, and art blank books; 3. There are four types of binding: paperback, threaded, loose-leaf, and purse; 4. There are two books that…
International standard format includes folio, 16 karats, 32 karats, 64 karats. The workbook is generally 16 karat, that is, A4 (16k) 297mm×210mm. There are also A5 (32k) 210mm × 148mm, A6 (64k) 144mm × 105mm, A2 (2k) 420mm × 594mm, etc.
