First, grating is projected on measured free surface, and height data of each point on free surface is measured by the grating projection method.
首先将矩形光栅投影在被测表面上，利用光栅投影法测量自由曲面上每点高度信息。
This paper is concerned with the accuracy of height anomaly in the reduction of length projection for EDM.
本文对电磁波测距边投影归算中的高程异常精度问题进行了讨论。
The longitudinal ends have a thickness that is greater than the width of the slot minus the height of the projection.
纵向末端的厚度，大于凹槽的宽度减去卡楯的高度。
The longitudinal ends have a thickness that is greater than the width of the slot minus the height of the projection.
纵向末端的厚度，大于凹槽的宽度减去卡楯的高度。
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