When periodic signals are analyzed in the laboratory, we measure the frequency spectrum of signals usually by a selection level meter.
在实验室进行周期信号分析时，通常使用选频电平表来测量其频谱。
This paper introduces the level meter selection procedure in Hangzhou Refinery, aswell as the application of steel belt level meter.
介绍了杭州炼油厂液位仪表的选择，以及钢带液位计的应用情况。
The paper elaborately introduces the working principle and characteristic of the radar fluid-level meter, the composition of the survey system, type selection requirement and installed essentials etc.
本文详尽地介绍了雷达液位计的工作原理及特性，测量系统的组成，选型要求和安装要点等。
The paper elaborately introduces the working principle and characteristic of the radar fluid-level meter, the composition of the survey system, type selection requirement and installed essentials etc.
本文详尽地介绍了雷达液位计的工作原理及特性，测量系统的组成，选型要求和安装要点等。
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