Frequency is the most accuracy measurement quantity in the nature. 摘要频率是自然界中测量得最准的物理。
In order to accuracy measurement data,the process of measurement must be controlled. 要保证测量数据准确可靠,必须对测量过程进行控制。
The preliminary conclusion of practical applications and technical analyses is that the highest control level of high accuracy measurement can possibly reach 0.5%. 工程应用实践及技术分析得出的初步结论是：高准确度应用的最高控制水平可以达到0.
The time variable measurement of high distinguishability is one of key technology in magnetostrictive liquid level sensor in order to realize high accuracy measurement. 高分辨力时间量检测是磁致伸缩液位传感器实现高准确度测量的关键技术之一。
The source-based radiometry is a traditional method with poor accuracy compared to detector-based radiometry owing to the difficulty of high accuracy measurement of blackbody temperature. 目前,传统辐射定标方法的精度已逐渐难以满足定量遥感应用的需求。