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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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fire door set
fire dragon
fire dynamics
fire effects on the stage
fire elevator
fire emergency broadcast system
fire emergency lighting and evacuating system
fire emergency lighting device
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fire extinguishing system
fire extinguishment
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firefighter protective equipments
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更新时间:2025/12/15 5:18:41