Eurekalert
Searchable database of science-related press releases from research institutions, universities, government agencies and corporations. Calendar, resources and links. From the American Association for the Advancement of Science.
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收录时间：2025-04-20Botanical-online
Personal site with miscellaneous botanical content, including photos, educational information about botany, medicinal and poisonous plants, and gardening. In English and Spanish.
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收录时间：2025-03-11Allaboutcircuits
Online book by Tony R. Kuphaldt on dc and ac electric circuits, semiconductor devices, analog and digital circuits.
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收录时间：2025-04-20Algebra
Interactive homework problems. Topics include Pre-Algebra, linear Algebra and other college Algebra.
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收录时间：2025-04-18Easycalculation
Features calcutors for arithmetic functions, scientific computations, binary conversions, areas, finanical interest, prime numbers, recurring fractions, factoring, matrices, HEX color converter, date and day calculations, as well as for measuring bandwidth.
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收录时间：2025-04-21Socalgas
Services residential and business clients. Includes options to pay bill online, request services, along with information pertaining to builder services, consulting services, regulatory and safety.
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收录时间：2025-04-19Nationalinterest
A quarterly journal of international affairs and diplomacy founded by Irving Kristol. Noted for its issue featuring the "End of History" by Francis Fukuyama.
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收录时间：2025-04-20Calculatorsoup
Online calculators for finance, math, algebra, trigonometry, fractions, geometry, physics, time, statistics and conversions.
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收录时间：2025-04-19Alldatasheet
Free datasheet archive and search for electronic components and semiconductors.
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收录时间：2025-04-09Italki
italki.com is an online destination for learning foreign languages. italki connects people from around the world in a friendly community to learn from each other. italki helps people meet online to do free language exchanges. italki also helps students connect with teachers for paid online lessons. In addition, italki has many free language learning features, such as questions and answers, group discussions, and multimedia materials for self-study. italki is both a social network and a marketplace. The social network helps bring people together to communicate and learn. The marketplace gives students, teachers, and companies the abililty to transact online.
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收录时间：2025-03-01
