A: Yes, a book comes first, just like a person's name. Just like two people with the same name and surname in the class, how do you distinguish them?

If there are several books in the same book, are the classification numbers of these books the same?

A: There is such a situation. For example, if I buy several sets of a book, it has only one number, because it is a book, and a book number represents a book. In order to distinguish similar books, a book number should be given when compiling the book classification number.