已知集合 $A=\left\{(x, y) \mid x^{2}+y^{2} \leqslant 3, x \in Z, y \in Z\right\}$, 则 $A$ 中元素的个数为 ($\qquad$)
Gaokao · Math · previous-year question
- A.9
- B.8
- C.5
- D.4
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