The endangerment of electric leakage trouble in cathode protection system is explained in detail by using the basic calculation formula in this paper.
本文用阴极保护基本计算公式，较详细地说明了阴极保护系统中漏电故障的危害。
This paper introduces a basic principle and calculation formula of measuring the horizontal distance and elevation difference by central hair stadia, and analyzes its measuring precision.
介绍了中丝视距法测量水平距离和高差的基本原理及计算公式，并对其测量精度进行了分析。
The basic principle of speckle image correlation digital technique was introduced firstly in this paper. And Calculation formula of deformation was also presented.
文中首先介绍了散斑图像相关数字技术的基本原理，然后给出了变形计算公式。
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