... 垂直度；垂直性 verticality 不垂直度 imperpendicularity; nonperpendicularity 垂直度测量 squareness measurement ...
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In this article, the method is described for measuring the scales of the two coordinate axes of a CCD plate through astronomical observations and the nonperpendicularity of the axes.
本文叙述了用天文观测测定CCD片子上两坐标各自比例尺和两坐标轴不垂直度的方法；
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