圆心在y2=2x上,且与x轴及抛物线准线均相切的圆的方程是( )
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A.(x-
)2+(y-2)2=1 B.(x-
)2+(y±1)2=1
C.(x-1)2+(y-2)2=4 D.(x-1)2+(y±2)2=4