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- Time and frequency primary standard 时间与频率基准
- Check the solution against a primary standard. 对照原来的标准液来检验此溶液。
- Study on extending measurement range of viscosity primary standard. 扩大粘度基准量程的研究。
- A new automated spectro radiometric calibration system is used to establish the new national primary standard of color temperature. 用一个自动的光谱辐射校准系统建立新的国家色温度基准。
- This paper briefly describes the principle, structure and performances of the national primary standard manometer built at the NIM in 1986. 本文概要介绍中国计量科学研究院于1986年建立的国家气压基准器的原理、结构和性能。
- System of Primary Standard for Vibration at Low Frequency 低频水平向振动基准装置
- Quality of entire county environment is good, atmosphere stability is in primary standard, pollution is little, have the favorable environment that produces green food and requirement. 全县环境质量良好,大气稳定在一级标准,污染少,具备生产绿色食品的良好环境和条件。
- All date issued are traceable to National and International Primary Standards of verification. 本中心所出具的数据均可溯源到国际和国家计量基准。
- System of Primary Standard for Horizontal Vibration at Low Frequency 低频垂直向振动基准装置
- For some research purposes and possibly for referee work, analyzed primary standards may be obtained from the U.S. Bureau of Standards. 对于某些研究工作和仲裁工作，可以从美国标准局获得经过分析的一级标准物。
- High frequency vibration primary standard for the magnitude and phase 高频振动幅值和相位基准
- Primary standard for Brinell hardness standard 布氏硬度基准装置
- He varied the transmission frequency. 他变换了无线电传送的频率。
- Primary standard for mid-frequency vibration 中频振动基准装置
- Primary standard for plastic Rockwell hardness 塑料洛氏硬度基准装置
- A unit of frequency equal to one cycle per second. 赫兹频率的单位，等于每秒一周
- primary standard for magnetic unit 磁学量单位基准器
- primary standard of magnetic field strength 磁场强度基准器
- Fatal accidents have decreased in frequency over recent years. 近年来死亡事故发生的频率已经下降。
- universal primary standard substance 通用基准物
