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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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essential surface
essential thrombocythemia
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Essequibo River
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EST
established by usage
establishiment of contract
establishing identity
Establishing New Political and Economic Order for the World
establishing of factory system
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establishment and approval of museum
establishment of company
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