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。
The technology of high accuracy measurement using laser beam as a straight datum II. 激光基准高精度测量技术2。
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 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。