片语
leveling precise精密水平测量
precise level leveling instrument精密水平仪
precise trigonometric leveling精密三角高程测量
precise leveling staff精密水準标尺
precise leveling i trument精密水準仪
EDM precise trigonometrical levelingEDM精密三角高程测量
precise leveling instrument精密水準仪
Improvement of Precise Leveling Instruments精密水準测量器具的改进
precise leveling rod精选密水平标尺