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There is no library without school. How to find books and materials if you want to learn professional things?
First, you can go to public libraries, such as provincial libraries and municipal libraries.

Second, you can use free electronic resources online.

1, Superstar Digital Library has a large number of professional books, which can be read online for free.

2. There are a large number of papers published by domestic researchers in China preprint service system and China scientific papers online, which can be downloaded and read for free;

3.DOAJ and Open J-gate have a large number of foreign scientific and technological documents, which can be downloaded and read for free.