设集合 $M=\{0,1,2\}, N=\left\{x \mid x^{2}-3 x+2 \leqslant 0\right\}$, 则 $M \cap N=(\qquad)$
Gaokao · Math · previous-year question
- A.$\{1\}$
- B.$\{2\}$
- C.$\{0,1\}$
- D.$\{1,2\}$
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