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
Time
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Science
Natural science
Physics
System of units
List of systems of units
International System of Units
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words: 308
articles: 14
Table of contents
308
14
Frequency
Time
10
3
Period (physics)
Frequency
Hertz (1857-1894, Hz)
Frequency
10
1
Megahertz (MHz)
Hertz
6
Clock
Time
298
3
Quartz clock
Clock
51
Atomic clock
Clock
247
1
Caesium standard (1967, 3.26 cm)
Atomic clock
58
Unit of time
Time
5
Decimal time
Unit of time
Second (s)
Unit of time
Day (d)
Unit of time
1
Calendar
Day
Year (y)
Unit of time
Ancestors
International System of Units
List of systems of units
System of units
Physics
Natural science
Science
Ciro Santilli's Homepage
Incoming links
Spacetime interval