10.
已知单位向量\( \overrightarrow{i}, \overrightarrow{j}, \overrightarrow{k}\)两两的夹角均为\(θ(0 < θ < π\),且\(θ\neq \dfrac {π}{2})\),若空间向量\( \overrightarrow{a}\)满足\( \overrightarrow{a}=x \overrightarrow{i}+y \overrightarrow{j}+z \overrightarrow{k}(x,y,z∈R)\),则有序实数组\((x,y,z)\)称为向量\( \overrightarrow{a}\)在“仿射”坐标系\(O-xyz(O\)为坐标原点\()\)下的“仿射”坐标,记作\( \overrightarrow{a}=(x,y,z)_{θ}\)有下列命题:
\(①\)已知\( \overrightarrow{a}=(1,3,-2)_{θ}, \overrightarrow{b}=(4,0,2)_{θ}\),则\( \overrightarrow{a}⋅ \overrightarrow{b}=0\);
\(②\)已知\( \overrightarrow{a}=(x,y,0)_{ \frac {π}{3}}, \overrightarrow{b}=(0,0,z)_{\_ \frac {π}{3}}\)其中\(xyz\neq 0\),则当且仅当\(x=y\)时,向量\( \overrightarrow{a}\),\( \overrightarrow{b}\)的夹角取得最小值;
\(③\)已知\( \overrightarrow{a}=(x_{1},y_{1},z_{1})_{θ}, \overrightarrow{b}=(x_{2},y_{2},z_{2})_{θ},{则} \overrightarrow{a}+ \overrightarrow{b}=(x_{1}+x_{2},y_{1}+y_{2},z_{1}+z_{2})_{θ}\);
\(④\)已知\( \overrightarrow{OA}=(1,0,0)_{ \frac {π}{3}}, \overrightarrow{OB}=(0,1,0)_{ \frac {π}{3}}, \overrightarrow{OC}=(0,0,1)_{ \frac {π}{3}}\),则三棱锥\(O-ABC\)的表面积\(S= \sqrt {2}\),其中真命题有 ______ \((\)写出所有真命题的序号\()\)