Gaokao Math Practice Question
3. (5 分）下面是关于复数 $z=\frac{2}{-1+i}$ 的四个命题：其中的真命题为 $(\quad)$, $p_{1}:|z|=2$, $\mathrm{p}_{2}: \mathrm{z}^{2}=2 \mathrm{i}$, $p_{3}: z$ 的共轭复数为 $1+i$, $p_{4}: z$ 的虚部为 -1 .
- A.$\mathrm{p}_{2}, \mathrm{p}_{3}$
- B.$p_{1}, p_{2}$
- C.$\mathrm{p}_{2}, \mathrm{p}_{4}$
- D.$p_{3}, p_{4}$
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