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本文介绍一种以激光作为测量光源， 利用光敏电阻随光线强弱变化而阻值随之变化的特性， 控制或门电路工作， 并在数字电压表上显示水面高度的测量仪
This article describes a laser as a measuring light source, the use of light-sensitive resistance as the resistance changes with the light intensity changes along with the characteristics of the control circuit or work, and in the digital voltmeter shows the water surface height measuring instrument