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近年来,作者和出版商都愿意免费提供作品的电子版,以扩大书籍的影响力。但是,发行免费电子版对图书销售有什么影响呢?美国全国学术出版社就是免费提供全部书
In recent years, authors and publishers are willing to provide electronic copies of their works free of charge to broaden the influence of books. However, the issue of free electronic version of book sales What impact? National Academic Press is free to provide all the books