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atomic second
释义
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atomic clock
atomic second
atomic second
[
ə′täm·ik ′sek·ənd
]
(physics)
As defined in 1967, the duration of 9,192,631,770 periods of the radiation corresponding to the two hyperfine levels of the fundamental state of the atom of cesium-133.
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更新时间:2025/12/13 17:22:25