The plumbline is always perpendicular to the horizontal plane.
铅垂线总是垂直于水平面的。
The plumbline is always perpendicular to the horizontal plane.
铅垂线总是垂直于水平面的。
A new means of determining astro geodetic deflection of the vertical CCD automatic astrometer and the new method to determine the difference of height anomalies between two points are described.
介绍当今确定天文大地垂线偏差的———CCD自动天体测量和确定点间高程异常差的方法。
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