Metric-conversions
Provides free online conversion tools, which can be added to any websites. It also offers metric conversion tables for download and print.
http://Metric-conversions.org/百度权重：
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收录时间：2025-05-15News.nationalgeographic
Offers daily news from several areas of science and technology.
http://News.nationalgeographic.com/百度权重：
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收录时间：2025-05-12Sigmaaldrich
Manufacturer of laboratory reagents in all fields of life sciences, including biochemistry, molecular biology, cell culture and cell biology.
http://Sigmaaldrich.com/百度权重：
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收录时间：2025-05-14Sciencealert
Science news & entertainment for a new generation of knowledge lovers.
http://Sciencealert.com/百度权重：
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收录时间：2025-05-15Sciencemag
International weekly science journal, published by the American Association for the Advancement of Science (AAAS).
http://Sciencemag.org/百度权重：
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收录时间：2025-05-14Scientificamerican
Monthly magazine of science. Website includes articles from past issues.
http://Scientificamerican.com/百度权重：
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收录时间：2025-05-12- 百度权重：
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收录时间：2025-05-14 Livescience
This site explains the latest research on the planet, from human biology to the animal world and the forces of nature.
http://Livescience.com/百度权重：
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收录时间：2025-05-15Sciencedirect
An information source for scientific, technical, and medical research. Subscription required for some sections.
http://Sciencedirect.com/百度权重：
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收录时间：2025-05-15Researchgate
Social community for researchers, fostering collaboration and knowledge exchange among researchers worldwide.
http://Researchgate.net/百度权重：
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收录时间：2025-05-03
