若overrightarrow(a)=a_{x),a_(y),a_(z)}，则平行于向量overrightarrow(a)的单位向量为(a_{x))/(|overrightarrow(a)|),(a_(y))/(|overrightarrow(a)|),(a_(z))/(|overrightarrow(a)|)}A. 1 对B. 2 错

若$\overrightarrow{a}=\{a_{x},a_{y},a_{z}\}$，则平行于向量$\overrightarrow{a}$的单位向量为$\{\frac{a_{x}}{|\overrightarrow{a}|},\frac{a_{y}}{|\overrightarrow{a}|},\frac{a_{z}}{|\overrightarrow{a}|}\}$

A. 1 对

B. 2 错