每分钟秒针跑一周.每小时为60分钟,分针要跑1周,秒钟跑60周.每天24小时,时针跑2周,分钟跑24周,秒针跑24x60=1440周.周期比T1:T2:T3 = 1/2 :1/24 :1/1440 = 720 :60 :1角速度比W1:W2:W3 = 1/T1 :1/T2 :1/T3 = 1/720 :1/60 :1 = 1 :12 :720
