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[期刊论文] 作者:LIU Nian-Feng,FANG Fang,CHEN Wei-Liang,LIN Ping-Wei,WANG Ping,LIU Kun,SUO Rui, 来源:中国物理快报(英文版) 年份:2013
In 1967,the SI time unit,second,was defined as "the duration of 9192631770 periods of the radiation corresponding to the transition between the two hyperfine le...
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