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    OALib图书馆www.oalib.com Open Access Library (www.oalib.com) is an academic search engine and publisher. You can download research papers for free and submit your paper to it. It is a shared academic database.

    点击进入 - 2022-12-25 - 收藏
  • ResearchGate官网

    ResearchGate官网

    ResearchGATE是一个社交网络服务网站，于2008年5月上线。网站旨在推动全球范围内的科学合作，用户可以联系同行，了解研究动态，分享科研方法以及交流想法。Find over 80 million publications, 7 million researchers and 1 million answers to research questions. ResearchGate is a network dedicated to science and research. Connect, collaborate and discover scientific publication

    点击进入 - 2015-10-06 - 收藏
  • Scientific American

    Scientific American

    Latest news and features on science issues that matter including earth, environment, and space. Get your science news from the most trusted source!www.scientificamerican.com

    点击进入 - 2015-04-11 - 收藏
  • 联合国教科文组织

    联合国教科文组织

    UNESCO has 193 Member States and seven Associate Member States. It is governed by the General Conference and the Executive Board. The Secretariat, headed by the Director-General, implements the decisions of these two bodies.

    点击进入 - 2011-11-25 - 收藏