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如图,在⊙O中,AB是直径,CD是弦,AB⊥CD于M,下列四个结论: ①CM=D...
如图,在⊙O中,AB是直径,CD是弦,AB⊥CD于M,下列四个结论:
①CM=DM,②AC=AD,③
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102335646949720/SYS201311031023356469497007_ST/0.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102335646949720/SYS201311031023356469497007_ST/1.png)
,④∠C=∠D.
其中成立的有( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102335646949720/SYS201311031023356469497007_ST/images2.png)
A.1个
B.2个
C.3个
D.4个
考点分析:
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