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The standard line of book editing and proofreading quality is that the error rate does not exceed ().
A: A.

The quality standard of book editing and proofreading is based on the error rate. The error rate of book editing and proofreading refers to the ratio of the number of editing and proofreading errors in a book to the total number of words in the book, expressed in units of ten thousand. Books with an error rate of no more than 1/10000 are qualified for editing and proofreading; The proofreading quality of books with an error rate of more than 1/10000 is unqualified.