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【简答题】
在图示的钟表传动示意图中，E为擒纵轮，N为发条盘，S、M及H分别为秒针、分针和时针。设z 1 =72，z 2 =12，z 3 =64，z 4 =8，z 5 =60，z 6 =8，z 7 =60，z 8 =6，z 9 =8，z 10 =24，z 11 =6，z 12 =24，求秒针与分针的传动比i SM ，及分针与时针的传动比i MH 。
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