Gaokao Math Practice Question
设集合 $A=\{1,2,4\}, B=\left\{x \mid x^{2}-4 x+m=0\right\}$. 若 $A \cap B=\{1\}$, 则 $B=(\qquad)$
- A.$\{1,-3\}$
- B.$\{1,0\}$
- C.$\{1,3\}$
- D.$\{1,5\}$
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