The quality assurance system of books, newspapers and periodicals stipulates that the error rate exceeds 1/10000 as unqualified products. That is, at most one error per 10 thousand words is allowed. Of course, the number of words here refers to the number of words in the layout, not the actual number of words. Political, religious, ethnic and other major mistakes, five points for each mistake; Punctuation marks each 0.5; The same mistakes in the book can be counted repeatedly, but at most five. Cover errors count as two each.