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设直线x+ky-1=0被圆O:x2+y2=2所截弦的中点的轨迹为M,则曲线M与直...
设直线x+ky-1=0被圆O:x2+y2=2所截弦的中点的轨迹为M,则曲线M与直线x-y-1=0位置关系为( )
A.相离
B.相切
C.相交
D.不确定
考点分析:
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