1. Postgraduate entrance examination? Anyone who wants to consult the medical literature should know that it provides search and abstract of biomedical papers. Its database source is MEDLINE. Its core theme is medicine, but it also includes other fields related to medicine, such as nursing or other health disciplines.

2. Hownet, CNKI's literature can be said to be the most comprehensive, and I won't say much about the basic introduction, but the fee of Hownet is relatively high. I suggest you go to a treasure to buy an account for a few dollars, which can be used for a long time.

3. Wan Fang data, Wanfang is quite easy to use, covering more than 70 kinds of scientific and technological full texts in five categories, including conference papers, dissertations, patents, periodicals, scientific and technological reports, laws and regulations, local chronicles and achievements. In short, it is also a large-scale network database, which goes hand in hand with China HowNet in the field of domestic academic literature. Of course, there are some documents.

4.ProQuest, ProQuest is the earliest and largest collection and supplier of doctoral and master's dissertations in the world. The ProQuest Digital Dissertation (PQDD) of our company has collected 6,543.8+0.6 million abstracts and indexes of excellent doctoral and master's dissertations in foreign universities, of which 6,543.8+0.0 million have full texts. PQDD has very important reference value in academic research.

5.Google Academic Search is a network application, which can search academic articles for free, including most published academic journals in the world. It is a simple method to search academic documents extensively.

6. GeenMedical, a Pubmed localization platform, integrates the resources of PubMed, SCI-HuB, Baidu Academic and ResearchGate, which can not only retrieve documents, but also directly lay down most of them.