针对组合形状零件几何尺寸测量中的关键问题—轮廓识别，提出了一种基于弧长的轮廓特征点提取的方法。
An approach to extract feature points on the boundary based on length of arc is proposed in view of the key problem of measuring composite-shape parts.
介绍CA8020型双踪示波器的常见故障现象及其产生的原因，给出了关键点测量数据和故障处理方法。
The article introduces some common fault phenomena of the CA8020 type double oscillograph working and the reasons which cause them provides the measurement of the key and the methods of repair.
测量点集网格拓扑重建是曲面重建的关键技术之一。
Mesh topology reconstruction is one of the key technologies of surface reconstruction.
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