Pubchem.ncbi.nlm.nih
Free database of chemical structures of small organic molecules and information on their biological activities. Linked with NIH PubMed/Entrez information retrieval system.
http://Pubchem.ncbi.nlm.nih.gov/百度权重:
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收录时间:2025-02-27Mathforum
Features combined archive and portal to web resources, educational issues, help forums, mailing lists, and teaching materials.
http://Mathforum.org/百度权重:
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收录时间:2025-02-23Studyspanish
Learn Spanish online. Free tutorial with audio, cultural notes, a random idiom generator, a list of Spanish schools, and links to other helpful sites.
http://Studyspanish.com/百度权重:
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收录时间:2025-03-10Xilinx
Manufactures a 10 Gbps SERDES aimed at the SONET and Ethernet markets, in addition to their programmable logic line.
http://Xilinx.com/百度权重:
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收录时间:2025-04-04Statcan.gc
Provides economic, social and census data, related publications, news, and education resources.
http://Statcan.gc.ca/百度权重:
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收录时间:2025-03-15Sciencebuddies
Topic Selection Wizard helps students pick a project topic. Experienced scientists answer student questions in an online forum. Step-by-step project help guide.
http://Sciencebuddies.org/百度权重:
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收录时间:2025-03-01- 百度权重:
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收录时间:2025-02-27 Simplypsychology
Psychology articles and resources targeted at A-level and degree students.
http://Simplypsychology.org/百度权重:
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收录时间:2025-03-31Mdpi
MDPI has been publishing scholarly, peer-reviewed open access journals since 1996. Searchable by title, author and article type.
http://Mdpi.com/百度权重:
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收录时间:2025-03-24- 百度权重:
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收录时间:2025-03-27
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