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如图,⊙O1与⊙O2相交于A,B两点,直线PQ与⊙O1相切于点P,与⊙O2相切于...
如图,⊙O
1与⊙O
2相交于A,B两点,直线PQ与⊙O
1相切于点P,与⊙O
2相切于点Q,AB的延长线交PQ于C,连接PA,PB.下列结论:①PC=CQ;②
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430783921/SYS201311031008504307839027_ST/0.png)
;③∠PBC=∠APC.其中错误的结论有( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430783921/SYS201311031008504307839027_ST/images1.png)
A.3个
B.2个
C.1个
D.0个
考点分析:
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用一把带有刻度的直角尺,
①可以画出两条平行的直线a与b,如图(1)
②可以画出∠AOB的平分线OP,如图(2)
③可以检验工件的凹面是否成半圆,如图(3)
④可以量出一个圆的半径,如图(4)
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上述四个方法中,正确的个数是( )
A.4个
B.3个
C.2个
D.1个
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如图,CA,CB分别与⊙O相切于点D,B,圆心O在AB上,AB与⊙O的另一交点为E,AE=2,⊙O的半径为1,则BC的长为( )
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A.
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B.2
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C.
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D.
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如图,PB为圆O的切线,B为切点,连接PO交圆O于点A,PA=2,PO=5,则PB的长为( )
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A.4
B.
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C.
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D.
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如图,AP为圆O的切线,P为切点,OA交圆O于点B,若∠A=40°,则∠APB等于( )
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A.25°
B.20°
C.40°
D.35°
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如图,直线AB、CD相交于点O,∠AOC=30°,半径为1cm的⊙P的圆心在射线OA上,且与点O的距离为6cm,如果⊙P以1cm/s的速度沿由A向B的方向移动,那么⊙P与直线CD相切时运动时间为( )
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A.4秒
B.8秒
C.4秒或6秒
D.4秒或8秒
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