Once the water level is lower than the line, we must add distilled water or liquid battery, do not directly tap water, it will form a damaged battery.
一旦水位低于下标线，就要加蒸馏水或电瓶补充液了，千万不要直接加自来水，这样会形成电瓶损坏。
This paper introduces a multi place liquid level measurement system, which employed eight linear array CCD for real time image capture of each liquid dividing line.
本文提出一套多界面位置实时监控系统。该系统采用八个线阵CCD像感器分别接收每个界面的光学图像。
This article gives an easy way in which laser plumb line is set up by means of He-Ne laser in space with the liquid level as the base.
本文叙述以液面为基准面，用小型氦-氖激光器在空间建立激光垂直线的简易方法。
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