1) A ball over three circles
三环顶球
1.
"A ball over three circles", a device for demonstrating persistence of vision andcolour blending, is introduced in this paper,and is presented the making and operation of the de-vice.
本文介绍一种演示视觉暂留现象和颜色合成的实验装置——三环顶球,简述该装置的制作过程和操作方法。
2) Single layer braced dome of 3/4 sphere
四分之三球穹顶网壳
3) vertex of spherical triangle
球面三角形的顶点
6) top ring
顶环
1.
The structure characteristic & optimization of locomotive diesel engine piston top rings;
机车柴油机活塞环顶环结构特点及其优化
补充资料:顶球
1.高山族的体育活动项目之一。
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