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Gaokao Math Practice Question

10. (5 分) 已知抛物线 $C: y^{2}=8 x$ 的焦点为 $F$, 准线为 $I, P$ 是 $I$ 上一点, $Q$ 是直 线 $P F$ 与 $C$ 的一个交点, 若 $\overrightarrow{F P}=4 \overrightarrow{F Q}$, 则 $|Q F|=(\quad)$

  1. A.$\frac{7}{2}$
  2. B.3
  3. C.$\frac{5}{2}$
  4. D.2

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