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一个钢管放在V形架内,如图是其截面图,O为钢管的圆心.如果钢管的半径为25cm,...
一个钢管放在V形架内,如图是其截面图,O为钢管的圆心.如果钢管的半径为25cm,∠MPN=60°,则OP=( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963020_ST/images0.png)
A.50cm
B.25
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963020_ST/0.png)
cm
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963020_ST/1.png)
cm
D.50
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963020_ST/2.png)
cm
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A.AD=
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BC
B.AD=
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AC
C.AC>AB
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图中,EB为半圆O的直径,点A在EB的延长线上,AD切半圆O于点D,BC⊥AD于点C,AB=2,半圆O的半径为2,则BC的长为( )
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已知圆O的半径为R,AB是圆O的直径,D是AB延长线上一点,DC是圆O的切线,C是切点,连接AC,若∠CAB=30°,则BD的长为( )
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D.
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D.
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