If $\vec{P}+\vec{Q}=\vec{P}-\vec{Q}$, then
If $\vec{P}+\vec{Q}=\vec{P}-\vec{Q}$, then
- A
$\vec{P}=\overrightarrow{0}$
- B
$\vec{Q}=\overrightarrow{0}$
- C
$|\vec{P}|=1$
- D
$|\vec{Q}|=1$
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