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单词
carbon 12
释义
WordReference Random House Unabridged Dictionary of American English © 2024
carbon 12,
Chemistry
the 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
(kär
′
bən twelv
′
).
USA pronunciation
1940–45
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更新时间:2024/9/22 1:48:07