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1.Worm Drive with Double Enveloping Arc Surface Machined by Datum-plane Tool
平面二次包络弧面蜗杆传动收藏指正
2.Study on affection of the angle errors of pentagonal prism on establishing datum plane
五角棱镜角度误差对建立大尺寸平面基准的影响收藏指正
3.Application of Penta Prism in Establishing the Datum Plane for?Measuring Flatness in Large Scale Dimension
五角棱镜在建立大尺寸平面基准中的应用收藏指正
4.Therefore, the method of screen spreading is presented herein with the following basic feature: taking the surface of the perpendicular line at the end of the distortion and bottom as the datum plane, move the controlling point of every distortion part to the datum plane with the principle of changeless of geometry size, and then the spreading is formed.
为此提出一种屏幕展开方法，此方法的基本要点是，以扭曲面末端垂直线和底部起坡线所在的平面为基准面，将扭曲面各分块的控制点按几何尺寸不变的原则搬到基准面，即可形成展开图。收藏指正
5.The global SRTM3 data have been declassified in the beginning of 2005. The vertical datum for SRTM3 is EGM96 geoid, and the horizontal datum for SRTM3 is WGS84. In SRTM3 the nominal absolute altitude accuracy is 16m, and the absolute plane accuracy is 20 m.
就全球而言,SRTM3的原始数据已于2004年解密。收藏指正
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