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分析了特殊尺寸平面四杆机构的奇异位置，说明在此位置前后，实际机构的装配模式发生了变化，在计算机上实现四杆机构的动画演示或进行运动分析和力分析时需对其装配模式进行转换。
The singular position of special-size planar four-bar mechanism was analyzed. It shows that the assembly mode of the actual mechanism changed before and after this position. The assembly mode of the four-bar mechanism should be demonstrated on the computer when it is animated or the analysis of motion and force analysis Conversion.