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如图,已知⊙O的半径为5mm,弦AB=8mm,则圆心O到AB的距离是( ) A....
如图,已知⊙O的半径为5mm,弦AB=8mm,则圆心O到AB的距离是( )
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A.1mm
B.2mm
C.3mm
D.4mm
考点分析:
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