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2 天前 · The Global Positioning System (GPS), originally Navstar GPS, is a satellite-based radio navigation system owned by the United States government and operated by the United States Space Force. It is one of the global navigation satellite systems (GNSS) that provide geolocation and time information to a GPS receiver anywhere on or near the Earth where there is an unobstructed line of sight to ...
2 天前 · Jay-Z. Shawn Corey Carter (born December 4, 1969), known by his stage name Jay-Z, [a] is an American rapper, record producer, and entrepreneur. [8] Known for his involvement in the success of other artists, [9] [10] he was named the greatest rapper of all time by Billboard and Vibe in 2023. [11]
2 天前 · Carthage [a] was an ancient city in Northern Africa, on the eastern side of the Lake of Tunis in what is now Tunisia. Carthage was one of the most important trading hubs of the Ancient Mediterranean and one of the most affluent cities of the classical world. It became the capital city of the civilisation of Ancient Carthage and later Roman ...
2 天前 · Structure of a typical L-alpha-amino acid in the "neutral" form Amino acids are organic compounds that contain both amino and carboxylic acid functional groups.[1] Although over 500 amino acids exist in nature, by far the most important are the 22 α-amino acids incorporated into proteins.[2] Only these 22 appear in the genetic code of life.[3 ...
