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如图,一量角器放置在∠AOB上,角的一边OA与量角器交于点C、D,且点C处的度数...
如图,一量角器放置在∠AOB上,角的一边OA与量角器交于点C、D,且点C处的度数是20°,点D处的度数为110°,则∠AOB的度数是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185906707066112/SYS201311011859067070661009_ST/images0.png)
A.20°
B.25°
C.45°
D.55°
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