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挂钟分针的长10cm,经过45分钟,它的针尖转过的弧长是( ) A.πcm B....
挂钟分针的长10cm,经过45分钟,它的针尖转过的弧长是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102418005047809/SYS201311031024180050478010_ST/0.png)
πcm
B.15πcm
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102418005047809/SYS201311031024180050478010_ST/1.png)
πcm
D.75πcm
考点分析:
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