2.
以下四组向量中,互相平行的组数为\((\) \()\)
\(① \overrightarrow{a}=(2,2,1)\),\( \overrightarrow{b}=(3,-2,2)② \overrightarrow{a}=(8,4,-6)\),\( \overrightarrow{b}=(4,2,-3)③ \overrightarrow{a}=(0,-1,1)\),\( \overrightarrow{b}=(0,3,-3)④ \overrightarrow{a}=(-3,2,0)\),\( \overrightarrow{b}=(4,-3,3)\)