The complete Chinese standard book number is usually printed on the copyright page of books. It consists of an international standard book number (abbreviated as ISBN) and a book classification-species number, separated by horizontal lines or diagonal lines.
The ISBN begins with ISBN, followed by the following four paragraphs 10 digits:
Paragraph 1: The group number is the code name of a country, region, language or other organization. China group number is "7".
The second paragraph: the publishing house number, the publishing house code assigned by the National Standard Book Number Center. The publication number of People's Posts and Telecommunications Publishing House is 1 15.
The third paragraph: the serial number of books, the serial number of books published by the publishing house. Usually this part is used as the logo of the books managed by the publishing house.
The fourth paragraph: the check code is the tenth digit of the Chinese Standard Book Number. Used as a computer check for ISBN codes.
The above 10 bits are hyphenated.
Book classification-the category number consists of the category number and category number of the subject to which the book belongs.
Classification number: given by the publishing house according to the subject category of books and referring to the basic category of China Library Classification. Among them, industrial technology books are given according to the second category. So the code of this paragraph is 1~2 hanyu pinyin letters.
Category number: the serial numbers of different books in the unified book category published by the same publishing house.
The following is a complete ISBN example:
ISBN 7- 1 15-086 12-5/TP 1693
When readers look up books and buy books, they just need to tell the publishing house the book number of this book. Such as 086 12.
For example: ISBN 7-80697-847-X.
7: China
80697: name of publishing house
847: Book title
X: efficiency code