Based on the synthesis theory concerning the mixed point straight-line four-bar linkage in the special condition, a research method with the circle center and circle point as parameters is proposed.
对在特殊条件下混合点直线四杆机构的综合进行了研究，以圆心、圆点坐标为研究混合点直线四杆机构的参数，推导出一般条件下的综合公式并用实例验证了公式的正确性。
To the middle stage of Warring States period, the simplified form of circle-point pattern completely disappeared on the animal-shaped plate in Jibei area and Liaoxi area.
战国中期，简化圈点纹在冀北和辽西地区的动物纹牌饰中彻底消失。
To the middle stage of Warring States period, the simplified form of circle-point pattern completely disappeared on the animal-shaped plate in Jibei area and Liaoxi area.
战国中期，简化圈点纹在冀北和辽西地区的动物纹牌饰中彻底消失。
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