Gaokao Math Practice Question
已知集合 $\left.A=\left\{(x, y) \mid x^{2}+y^{2}=1\right\}, B=\{（ x, y) \mid y=x\right\}$, 则 $A \cap B$ 中元 素的个数为 ($\qquad$)
- A.3
- B.2
- C.1
- D.0
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