8.
已知集合\(M=\left\{ \left.(x,y) \right|y=f(x)\right\} \),若对于任意实数对\(\left({x}_{1},{y}_{1}\right)∈M \),存在\(\left({x}_{2},{y}_{2}\right)∈M \),使\({x}_{1}{x}_{2}+{y}_{1}{y}_{2}=0 \)成立,则称集合\(M\)是“垂直对点集”\(.\)给出下列四个集合:
\(①M=\left\{ \left.(x,y) \right|y= \dfrac{1}{{x}^{2}}\right\} \);\(②M=\left\{ \left.(x,y) \right|y={\log }_{2}x\right\} \);\(③M=\left\{ \left.(x,y) \right|y={2}^{x}-2\right\} \);\(④M=\left\{ \left.(x,y) \right|y=\sin x+1\right\} \) .
其中是“垂直对点集”的序号是