Ciro Santilli
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中国独裁统治 China Dictatorship 新疆改造中心、六四事件、法轮功、郝海东、709大抓捕、2015巴拿马文件 邓家贵、低端人口、西藏骚乱
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308
articles:
14
Table of contents
308
14
Frequency
link
Time
10
3
Period (physics)
link
Frequency
Hertz (1857-1894, Hz)
link
Frequency
10
1
Megahertz (MHz)
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Hertz
6
Clock
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Time
298
3
Quartz clock
link
Clock
51
Atomic clock
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Clock
247
1
Caesium standard (1967, 3.26 cm)
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Atomic clock
58
Unit of time
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Time
5
Decimal time
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Unit of time
Second (s)
link
Unit of time
Day (d)
link
Unit of time
1
Calendar
link
Day
Year (y)
link
Unit of time
Ancestors
International System of Units
List of systems of units
System of units
Physics
Natural science
Science
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