屋架安装质量主要检查屋架跨中对两支座中心竖向面的不垂直度；
Cross-check the main roof truss roof installation quality of the surface is not perpendicular to the vertical center two blocks;
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；
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；
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.
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