2. The content structure system of the whole book, and the structure system of the first book introduces the relevant contents in an orderly manner.
3. The viewpoint of book content is relatively stable, and books are mature and reliable because of their timeliness and timeliness.
4. The style of book content is consistent and unified, but the content of this book usually adopts the same style, and there are generally strict and unified requirements for the use of quantity units and numbers of scientific and technological books.
The length of a book is flexible. Different from periodicals, the flexibility of length does not mean randomness, and a book is often agreed upon as soon as it is drawn.
6. The publishing time of books is very flexible, and books have certain flexibility, which is related to the monthly or quarterly periodicity of periodicals.
Books are produced with the needs of human society. They inherit social memory, reproduce historical features and reflect the original records of human social practice. They are witnesses to the history of human civilization and play a very important role in social politics, economy, science and cultural activities.