8.
设有下面四个命题
\(p_{1}\):若复数\(z\)满足\( \dfrac {1}{z}∈R\),则\(z∈R\);
\(p_{2}\):若复数\(z\)满足\(z^{2}∈R\),则\(z∈R\);
\(p_{3}\):若复数\(z_{1}\),\(z_{2}\)满足\(z_{1}z_{2}∈R\),则\(z_{1}=\overset{}{\bar{{z}_{2}}} \);
\(p_{4}\):若复数\(z∈R\),则\(\bar{z} ∈R\).
其中的真命题为\((\) \()\)