满分5 >
初中数学试题 >
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/20131103000136753023513/SYS201311030001367530235005_ST/0.png)
cm
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000136753023513/SYS201311030001367530235005_ST/1.png)
cm
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000136753023513/SYS201311030001367530235005_ST/2.png)
cm
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000136753023513/SYS201311030001367530235005_ST/3.png)
cm
考点分析:
相关试题推荐
如图,△ABC为⊙O的内接三角形,AB是直径,∠A=20°,则∠B的度数是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000136753023513/SYS201311030001367530235004_ST/images0.png)
A.20°
B.40°
C.70°
D.160°
查看答案
如图,点A、B、C在⊙O上,AO∥BC,∠OBC=40°,则∠ACB的度数是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000136753023513/SYS201311030001367530235003_ST/images0.png)
A.10°
B.20°
C.30°
D.40°
查看答案
如图,在⊙O中,AB是弦,OC⊥AB,垂足为C,若AB=16,OC=6,则⊙O的半径OA等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000136753023513/SYS201311030001367530235002_ST/images0.png)
A.16
B.12
C.10
D.8
查看答案
下列三个命题:①圆既是轴对称图形,又是中心对称图形;②垂直于弦的直径平分这条弦;③相等圆心角所对的弧相等.其中是真命题的是( )
A.①②
B.②③
C.①③
D.①②③
查看答案
下列图形中,∠1与∠2不一定相等的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000136753023513/SYS201311030001367530235000_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000136753023513/SYS201311030001367530235000_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000136753023513/SYS201311030001367530235000_ST/images2.png)
D.
查看答案