作一组直角坐标轴，把各力都分解成正交分量。
Construct a set of rectangular axes and resolve any inclined forces into rectangular components.
该方法是以视距尺的定长作基线，利用经纬仪测定基线两端点的竖直角，求出立尺点至测站点间的距离。
This method apply the length of the stadia as base line, survey the vertical angular of the two ends of the base ling by theodolite and get the distance between the station and stadia.
应用推荐