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| physical second (интервал времени, равный 9.192.631.770,0 периодам колебаний цезиевого репера частоты); atomic second (интервал времени, равный 9.192.631.770,0 периодам колебаний цезиевого репера частоты) | |||
| atomic second | |||
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атомная секунда : 1 phrase in 1 subject |
| Astronomy | 1 |
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