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安装中文字典英文字典辞典工具!

安装中文字典英文字典辞典工具!










  • List of PDF software - Wikipedia
    PDFVue: a free web application that allows the user to view PDFs, comment and fill PDF forms from a web browser Generates a watermark Smallpdf: Free (trial) web-based PDF software for editing, signing, compressing, merging, splitting, rotating, unlocking and protecting PDF files
  • Review article - Wikipedia
    A review article is an article that summarizes the current state of understanding on a topic within a certain discipline [1] [2] A review article is generally considered a secondary source since it may analyze and discuss the method and conclusions in previously published studies
  • Wikipedia:Featured articles - Wikipedia
    Articles that no longer meet the criteria can be proposed for improvement or removal at featured article review On non-mobile versions of our website, a small bronze star icon on the top right corner of an article's page indicates that the article is featured On most smartphones and tablets you can also select "Desktop" at the very bottom of
  • Project Gutenberg - Wikipedia
    Project Gutenberg (PG) is a volunteer effort to digitize and archive cultural works, as well as to "encourage the creation and distribution of eBooks " [2] It was founded in 1971 by American writer Michael S Hart and is the oldest digital library [3]
  • Wikipedia - Wikipedia
    Wikipedia [b] is a free online encyclopedia that is written and maintained by a community of volunteers, known as Wikipedians, through open collaboration and the wiki software MediaWiki
  • List of academic databases and search engines - Wikipedia
    FREE Resources: 3 articles every 2 weeks (Register and Read Program, archived journals) Also, early journals (prior to 1923 in US, 1870 elsewhere) free, no registry necessary Free and Subscription JSTOR [89] Jurn: Multidisciplinary Jurn is a free-to-use online search tool for finding and downloading free full-text scholarly works
  • Elsevier - Wikipedia
    For most articles on the website, abstracts are freely available; access to the full text of the article (in PDF, and also HTML for newer publications) often requires a subscription or pay-per-view purchase [37] In 2019, Elsevier published 49,000 free open access articles and 370 full open access journals


















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