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Gaokao Math Practice Question

6. 设 $F$ 为抛物线 $C: y^{2}=4 x$ 的焦点, 点 $A$ 在 $C$ 上, 点 $B(3,0)$, 若 $|A F|=|B F|$, 则 $|A B|=$ ()

  1. A.2
  2. B.$2 \sqrt{2}$
  3. C.3
  4. D.$3 \sqrt{2}$

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