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【单选题】
点M(x 0 ,y 0 )是圆x 2 +y 2 =a 2 (a＞0)内不为圆心的一点,则直线x 0 x+y 0 y=a 2 与该圆的位置关系是 ( )A.
相切
B.
相交
C.
相离
D.
相切或相交
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