直线的倾斜角

直线的倾斜角直线的倾斜角
  1. 由一个水平仪和一个观测管组成的测量工具;用来测量从观测者到目标的直线的倾斜角。

    A surveying instrument consisting of a spirit level and a sighting tube ; used to measure the angle of inclination of a line from the observer to the target .