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点P(x,y,z)满足=2,则点P在( ) A.以点(1,1,-1)为圆心,以2...
点P(x,y,z)满足
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=2,则点P在( )
A.以点(1,1,-1)为圆心,以2为半径的圆上
B.以点(1,1,-1)为中心,以2为棱长的正方体上
C.以点(1,1,-1)为球心,以2为半径的球面上
D.无法确定
考点分析:
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