Gaokao Math Practice Question
4. (5 分) 设非零向量 $\vec{a}, \vec{b}$ 满足 $|\vec{a}+\vec{b}|=|\vec{a}-\vec{b}|$ 则（）
- A.$\vec{a} \perp \vec{b}$
- B.$|\overrightarrow{\mathrm{a}}|=|\overrightarrow{\mathrm{b}}|$
- C.$\vec{a} / / \vec{b}$
- D.$|\vec{a}|>|\vec{b}|$
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