... angular subtense 角距 subtense bar 视距尺 ; 横距杆 ; subtense measurement 夹角视距法 ...
基于142个网页-相关网页
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.
现在注视距面前约10 - 20英尺远的其他东西。
Now focus on something else about 10-20 feet in front of you.
可视距离小于2英尺。
应用推荐