14 小时之前 · Radio-frequency identification (RFID) uses electromagnetic fields to automatically identify and track tags attached to objects. An RFID system consists of a tiny radio transponder called a tag, a radio receiver, and a transmitter.When triggered by an electromagnetic interrogation pulse from a nearby RFID reader device, the tag transmits digital data, usually an …

14 小时之前 · Washington the Farmer at Mount Vernon, an 1851 portrait by Junius Brutus Stearns. During Washington's lifetime at least 577 slaves lived and worked at Mount Vernon. [267] [268] He inherited some, gained control of 84 dower slaves upon his marriage to Martha, and purchased at least 71 slaves between 1752 and 1773. [269]

14 小时之前 · Mozilla Firefox, or simply Firefox, is a free and open source [12] web browser developed by the Mozilla Foundation and its subsidiary, the Mozilla Corporation.It uses the Gecko rendering engine to display web pages, which implements current and anticipated web standards. [13] Firefox is available for Windows 10 or later versions of Windows, macOS, and Linux.

14 小时之前 · San Antonio (/ ˌ s æ n æ n ˈ t oʊ n i oʊ / SAN an-TOH-nee-oh; Spanish for "Saint Anthony") is a city in the U.S. state of Texas and the most populous city in Greater San Antonio, the third-largest metropolitan area in Texas and the 24th-largest metropolitan area in the United States at 2.6 million people in the 2020 U.S. census. [12] It is the most populous city in and the …

14 小时之前 · The Joint European Torus (JET) magnetic fusion experiment in 1991. Fusion power is a proposed form of power generation that would generate electricity by using heat from nuclear fusion reactions.In a fusion process, two atomic nuclei combine to form a heavier nucleus, releasing energy. Devices designed to harness this energy are known as fusion reactors. …

14 小时之前 · In 2015, the Model S was the world's best-selling plug-in electric vehicle. It has been the subject of multiple fires , the first in 2013. The car has received numerous accolades and commendations , including being named one of the Best 25 Inventions of the Year 2012 by Time and receiving the Tech Car of the Year for 2012 award from CNET .

14 小时之前 · Auckland (/ ˈ ɔː k l ə n d / AWK-lənd; [4] Māori: Tāmaki Makaurau) is a large metropolitan city in the North Island of New Zealand.It has an urban population of about 1,531,400 (June 2024). [2] It is located in the greater Auckland region, the area governed by Auckland Council, which includes outlying rural areas and the islands of the Hauraki Gulf, and …

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