Generally, the words "folio: (XXX )× (XXX) mm116" or 1/32, 1/64 "are marked on the copyright page of genuine books, which are not completely consistent with" folio "according to different specifications, so
Further, remember that 16 is 32 when folded in half, and 32 is 64 when folded in half. This will make it clear whether it is 16K or 32K. Opening can be understood as "cutting", which is an area unit derived from the traditional paper production process. A complete big piece of paper is an opening.
classify
There are hard leather and soft leather now. But there are other forms.
A hardcover book refers to a book cover that is thick and hard and different from the page size. The material of the book cover is generally made of recycled paper, and the outer bread is decorated with other papers. Because the cover is hard, there is a pit between the writing body and the spine, which is convenient to open. Hardcover is mostly used in large books or classic works, such as dictionaries, bibles, Sun Tzu's Art of War, etc.
Soft cover (paperback) means that the cover of a book is thick and soft, the size is the same as the number of pages. The materials of book covers are varied. Now, soft cover books usually have some glue to strengthen protection.
Sometimes in addition to the book cover, another book cover is added to wrap the book.