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fountain clock steered time scale
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fountain clock steered time scale
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fountain clock steered time scale
喷泉钟驾驭时标
结合喷泉钟高准确度和商品原子钟组的稳定性与可靠性,产生高准确、稳定、可靠时间频率信号的技术方案。国际计量局(BIPM)使用这种方案计算产生出国际标准时间(UTC)。
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jade wares with three branches of Liangzhu Culture
Jade Wenming in the Han Dynasty
Jade Workshops Site
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Jade Yue of Fanshan Cemetery
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Jade Zhi of the Han Dynasty
J. A. Dieudonnee
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J. A. Dieudonné(1906—1992)
jaeds from Guo State
JAERI
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Jaffe
Jaffe profile
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Jaffna Peninsula
J. A. F. Plateau
J. A. F. Plateau (1801—1883)
Jagang
Jagannatha
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jagged number
J-aggregate and H-aggregate
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