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
Clock
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Natural science
Physics
System of units
List of systems of units
International System of Units
Time
OurBigBook.com
words: 298
articles: 3
Table of contents
298
3
Quartz clock
Clock
51
Atomic clock
Clock
247
1
Caesium standard (1967, 3.26 cm)
Atomic clock
58
Ancestors
Time
International System of Units
List of systems of units
System of units
Physics
Natural science
Science
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