During the normal oil extraction process, a working fluid level is tested anytime, since the communicating hole always communicate the tuning and an annular.

在正常抽油时，由于连通孔始终连通着油管和油套环空，因而可随时对动液面进行测试。

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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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Through working out the differential equation of motion of the pseudo-fluid level in annular space, the depth of the...

通过求解环空拟液面的运动微分方程序得出以此，可以确定抽油井正常生产时环空拟液面的深度。

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Before landing, the flight crew were not aware the nose wheel steering system was not working, as the hydraulic fluid level was low.

BBC: NEWS | Europe | Isle of Man | Air crew criticised for fire risk