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如图所示,AB是⊙O的直径,AB=4,AC是弦,AC=,则∠AOC为
A.120° B.1300 C.140° D.150°
如图,AB是⊙O的直径,AB=4,AC是弦,AC=,∠AOC为( )
A.120° B.1300
C.140° D.150°