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钟表为什么有三根针?

因为一个小时是60分，一分是60秒。钟表上的三根针，短粗的是时针，粗长的是分针，细长的是秒针。钟表上有了这三根针，任何时候，只要一看这三根针在钟表上指的数字，就可知道是几时几分几秒了。

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