Gaokao Math Practice Question
若直线 $2 x+y-1=0$ 是圆 $(x-a)^{2}+y^{2}=1$ 的一条对称轴, 则 $a=(\quad)$
- A.$\frac{1}{2}$
- B.$-\frac{1}{2}$
- C.1
- D.$-1$
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