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已知圆C:x2+y2=1,点P(x,y)在直线x-y-2=0上,O为坐标原点,若...
已知圆C:x2+y2=1,点P(x,y)在直线x-y-2=0上,O为坐标原点,若圆C上存在点Q,使∠OPQ=30°,则x的取值范围是( )
A.[-1,1]
B.[0,1]
C.[-2,2]
D.[0,2]
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