比如，水和铝液密度的差异和在不同液位高度时相对压降必须正确地定标。
For example: the density differences and related pressure drop over the liquid layer must be scaled correctly.
针对双容水箱控制系统，提出了采用实时图像处理的方法来获取水箱液位高度。
For the double-holding water tank control system, we can get the height of the water of the double-holding water tank through real-time image processing.
设计了一种基于ARM7的液位控制系统，实现对液位高度的检测、显示以及控制。
A liquid level control system based on ARM7 is developed for measurement, display and control of the height of liquid level.
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