Gaokao Math Practice Question
7. (5 分) 过三点 $A(1,3), B(4,2), C(1,-7)$ 的圆交 $y$ 轴于 $M, N$ 两点, 则 $|\mathrm{MN}|=(\quad)$
- A.$2 \sqrt{6}$
- B.8
- C.$4 \sqrt{6}$
- D.10
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