| 单词 | caesium clock |
| 例句 | And if the fibre connection bringing the pips should be cut, the caesium clock takes over until a connection is restored. Stamp collectors 2015-10-29T04:00:00Z Even if the clocks pass this later test, usurping the caesium clock to create a more precise definition of the second will not be easy. Hyper-precise atomic clocks face off to redefine time 2015-06-01T04:00:00Z It was here in the 1930s that the physicist Louis Essen developed the first quartz ring clock, the most accurate timepiece of its day, and a precursor of the caesium clock. The element that redefined time 2014-10-03T04:00:00Z It's because this transition frequency is so much higher than the resonant frequency of quartz that a caesium clock is so much more accurate. The element that redefined time 2014-10-03T04:00:00Z Without the caesium clock, for example, satellite navigation would be impossible. The element that redefined time 2014-10-03T04:00:00Z |
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