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5题7一15图(a)所示凸轮导板机构中．偏心轮圆心为A，半径r，偏心距Q4为t，偏心轮绕O轴以匀角速ω转动。当导板CD在最低位置时，弹簧的压缩变形为6，导板质量为m，试求弹簧的刚度系数k为多大时，方使导板在运动过程中始终不离开偏心轮?
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