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本网页介绍了如何测量植物的鲜重、干重、根质量、根射比等指标，以评估植物的健康状况和生长速度。鲜重测量需要从土壤中移除植物并洗掉土壤，然后用纸巾擦干，立即称重。
Learn the meaning and history of debits and credits in double-entry bookkeeping, and how they are used to record changes in value from business transactions. Find out the rules and examples of debits and credits for different types of accounts.
Attribution is acknowledgment as credit to the copyright holder or author of a work. Learn about the legal and ethical aspects of attribution, the Berne Convention, and the Creative Commons license.
Learn about the history and meaning of the sound recording copyright symbol ℗, also known as the phonogram symbol, used to indicate the copyright of a sound recording (phonogram) embodied in a phonorecord. Find out how it is used in different countries and in the United States law.
Learn about the history and symbols of contactless payment systems, which use radio-frequency identification or near-field communication for secure transactions. See the EMV contactless symbol and the NFC logo used on compatible devices and terminals.
Cirrus is a worldwide interbank network that provides cash to Mastercard cardholders. Learn about the logo changes and the operating area of Cirrus, which connects all Mastercard cards and ATM cards issued by various banks worldwide.
A Creative Commons license is a public copyright license that enables the free distribution of a work with some conditions. Learn about the history, types, international use, and legal aspects of Creative Commons licenses.
A comprehensive list of symbols from various categories, such as basic communication, scientific and engineering, consumer, shipping, property and pricing, technology, religious and mystical, and more. Find the name and meaning of any symbol you are looking for.