32 无隐藏线（No Hidden Line） 移除隐藏线 着色（Shading） 缺省设置， 给模型着色、 隐藏线不显示， 使用这种显示方法， 可以看见曲面的轮廓或打印模型的副本...
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The connected matrix of topological relationships between vertices was renewed by occlusion matrix, and the projection drawing defined by connected matrix had no hidden line.
利用遮挡矩阵更新表示顶点间拓扑关系的连接矩阵，得到不含隐藏线的投影图。
Hidden failures in protection system are great threats to the operation of power grids, while there are almost no on-line diagnostic methods for hidden failures so far.
继电保护系统的隐藏故障对电网的运行威胁很大，而隐藏故障的在线诊断十分困难。
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