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单词 carbon 12
释义

WordReference Random House Unabridged Dictionary of American English © 2024
carbon 12, 
  1. Chemistrythe isotopic carbon atom that comprises 99 percent of naturally occurring carbon, and that since 1961 has been used as the standard for atomic weight by representing a unit of 12.00000.
Also, car•bon-12 (kärbən twelv).USA pronunciation 
  • 1940–45

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