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2017年2月25日 (星期六)
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2017年2月25日 (六) 11:02
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442字节
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Category:Atomic fountain clocks
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2015年4月26日 (星期日)
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2012年12月7日 (星期五)
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2012年12月7日 (五) 21:48
Cqdx
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Cat-a-lot
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Category:Rubidium clocks
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2010年9月4日 (星期六)
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2010年9月4日 (六) 06:54
Coenen
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{{Information |Description={{en|1=Rubidium (Rb) fountain atomic clock at the U.S. Naval Observatory}} |Source=U.S. Naval Observatory |Author=U.S. Naval Observatory |Date= |Permission= |other_versions= }} For description, see http://www.skyandtelescope.com
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