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秒长国家计量基准
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秒长国家计量基准
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频率标准
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national primary frequency standard
秒长国家计量基准
直接复现秒定义的实验装置。输出的标准频率具有最高计量学特性,作为统一全国秒长量值(频率量值)最高依据的计量器具,全国只有一套。
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administrative fee for river project construction and maintenance
administrative financial statement analysis
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科学参考收录了854744条科技类词条,基本涵盖了常见科技类参考文献及英语词汇的翻译,是科学学习和研究的有利工具。
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