If $\overrightarrow{P}=\overrightarrow{Q}$ then which of the following is NOT correct
(A) $\hat{P}=\hat{Q}$          (B) $\left|\overrightarrow{P}\right|=\left|\overrightarrow{Q}\right|$              (C) $P\hat{Q}=Q\hat{P}$               (D) $\overrightarrow{P}+\overrightarrow{Q}=\hat{P}+\hat{Q}$