The natural dynamic characteristics of curved box girders with the same radiusofcircle and different curved length are studied.
研究了在相同曲率下不同跨度的曲线箱梁的固有振动特性，以及曲线梁的扭转振型对曲线梁动力反应的贡献。
2
In the filed of computer vision and image processing, the characteristic parameters such as the center coordinates and radiusofcircle and arc parts often need to be measured by their images.
在计算机视觉和图像处理中，经常需要根据圆孔或圆弧的图像求取其中心坐标和半径等特征参数。
3
That is a circleofradius 1. That's the unit circle.