Botanical-online
Personal site with miscellaneous botanical content, including photos, educational information about botany, medicinal and poisonous plants, and gardening. In English and Spanish.
http://Botanical-online.com/百度权重：
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收录时间：2024-11-26Allaboutcircuits
Online book by Tony R. Kuphaldt on dc and ac electric circuits, semiconductor devices, analog and digital circuits.
http://Allaboutcircuits.com/百度权重：
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收录时间：2024-11-24Algebra
Interactive homework problems. Topics include Pre-Algebra, linear Algebra and other college Algebra.
http://Algebra.com/百度权重：
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收录时间：2024-11-07Easycalculation
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.
http://Easycalculation.com/百度权重：
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收录时间：2025-01-16Socalgas
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.
http://Socalgas.com/百度权重：
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收录时间：2024-11-07Nationalinterest
A quarterly journal of international affairs and diplomacy founded by Irving Kristol. Noted for its issue featuring the "End of History" by Francis Fukuyama.
http://Nationalinterest.org/百度权重：
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收录时间：2025-01-16Calculatorsoup
Online calculators for finance, math, algebra, trigonometry, fractions, geometry, physics, time, statistics and conversions.
http://Calculatorsoup.com/百度权重：
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收录时间：2025-01-16Alldatasheet
Free datasheet archive and search for electronic components and semiconductors.
http://Alldatasheet.com/百度权重：
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收录时间：2025-01-16Italki
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.
http://Italki.com/百度权重：
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收录时间：2025-01-16Aleks
Provides a complete web based educational environment for K-12 and Higher Education mathematics science, statistics, and business.
http://Aleks.com/百度权重：
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收录时间：2025-01-16
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