Observe the appearance of books

Cover: The cover of genuine books is often positive color with good quality.

Binding: Genuine books with more than 200 pages should be bound with sewing thread, plastic thread or wireless. However, due to the limitation of printing and binding equipment or in order to reduce costs, pirates still use wire binding for books with more than 300 pages.

Paper: Double-sided printing of books requires a certain thickness of paper, and the original book paper is generally more than 52 grams. If you encounter a book with thin paper and the handwriting on the other side is exposed, it may be a pirated book.

Read the text of this book carefully.

There are few typos, other words, variant characters, derivatives and sick sentences in the original book, and the typesetting is neat.

Although some pirated books are copied according to the original, they will cause more ink spots on the paper and fat handwriting, which is easier to distinguish.

Second, use the CIP number of the book for inquiry.

Log on to the website of the State Administration of Press, Publication, Radio, Film and Television/,and then click CIP data verification in the convenience query to enter the verification interface, enter the CIP nuclear font size, and then use the verification code to query.

Click "Verify" and the query result will appear. The CIP core number is [year number+serial number].