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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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"International System of Units"
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"International System of Units"
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Table of contents
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Frequency
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"Time"
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Period (physics)
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"Frequency"
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Hertz (1857-1894, Hz)
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"Frequency"
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Megahertz (MHz)
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"Hertz"
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Clock
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"Time"
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Quartz clock
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"Clock"
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Atomic clock
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"Clock"
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Caesium standard (1967)
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"Atomic clock"
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Unit of time
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"Time"
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Decimal time
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"Unit of time"
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Second (s)
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"Unit of time"
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Day (d)
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"Unit of time"
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Calendar
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"Day"
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Year (y)
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"Unit of time"
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International System of Units
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