“秒长国家计量基准”的概念、定义、翻译、参考文献-科学参考

单词	秒长国家计量基准
释义	秒长国家计量基准 Encyclopedia 工学频率标准释 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。
随便看	negative perfect correlation negative permeability materials negative permittivity materials negative phototropism negative plate negative platemaking negative Poisson's ratio material negative polarity items negative polarity machining negative polynomial distribution negative-positive photographic system negative pressure negative pressure injection negative pressure method for deposit negative-pressure pulverizer with intermediate storage bunker negative pressure region negative pressure suction appliance negative priming effect negative probability negative proposition negative punishment negative quadratic differential negative real axis negative real number negative recurrent state

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。