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5 天前 · Three generations: an older woman, her daughter, and her granddaughter. The word woman can be used generally, to mean any female human, or specifically, to mean an adult female human as contrasted with girl.The word girl originally meant "young person of either sex" in English; it was only around the beginning of the 16th century that it came to mean specifically a female child.
5 天前 · Almost all mountains in the list are located in the Himalaya and Karakoram ranges to the south and west of the Tibetan plateau. All peaks 7,000 m (23,000 ft) or higher are located in East, Central or South Asia in a rectangle edged by Noshaq (7,492 m or 24,580 ft) on the Afghanistan–Pakistan border in the west, Jengish Chokusu (Tuōmù'ěr Fēng, 7,439 m or 24,406 ft) on the Kyrgyzstan ...
2024年5月23日 · 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 ...
2 天前 · Chan Kong-sang[a] SBS MBE PMW[3] (born 7 April 1954), known professionally as Jackie Chan,[b][4][2][1] is a Hong Kong[5][6] actor, director, writer, producer, martial artist, and stuntman known for his slapstick acrobatic fighting style, comic timing, and innovative stunts, which he typically performs himself. Before entering the film industry ...
2024年5月23日 · 1. /. 3. A quark ( / kwɔːrk, kwɑːrk /) is a type of elementary particle and a fundamental constituent of matter. Quarks combine to form composite particles called hadrons, the most stable of which are protons and neutrons, the components of atomic nuclei. [1] All commonly observable matter is composed of up quarks, down quarks and electrons.
3 天前 · This list of Internet top-level domains (TLD) contains top-level domains, which are those domains in the DNS root zone of the Domain Name System of the Internet. A list of the top-level domains by the Internet Assigned Numbers Authority (IANA) is maintained at the Root Zone Database.[1] IANA also oversees the approval process for new proposed ...
2 天前 · Perfluorooctanoic acid (PFOA; conjugate base perfluorooctanoate; also known colloquially as C8, for its 8-carbon chain structure) is a perfluorinated carboxylic acid produced and used worldwide as an industrial surfactant in chemical processes and as a material feedstock. PFOA is considered a surfactant, or fluorosurfactant, due to its ...
