Based on the error resource analysis in one-way photoelectric triangulated heigh survey, the horizontal distance equation is drawn for optimal station away from survey point.
分析了单向光电三角高程测量的误差来源，在此基础上推导了最佳测站位置离测点的平距公式。
2
The differential equation of pump station start-up transient is established and derived from discharge balance and moment equation of pump unit.
本文从水量平衡及水泵机组力矩方程出发，建立起水泵从起动到同步的微分方程序。
3
Using Darcy-equation to calculate friction loss is more convenient, but using the comprehensive equation can improve calculation precision. A empirical method of dealing with pump station boundary…