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钟表的轴心到分针针端的长为5cm,那么经过40分钟,分针针端转过的弧长是( ) ...
钟表的轴心到分针针端的长为5cm,那么经过40分钟,分针针端转过的弧长是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102418005047809/SYS201311031024180050478013_ST/0.png)
cm
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102418005047809/SYS201311031024180050478013_ST/1.png)
cm
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102418005047809/SYS201311031024180050478013_ST/2.png)
cm
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102418005047809/SYS201311031024180050478013_ST/3.png)
cm
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