平面直角坐标系\(xOy\)中,点\(A(x_{1},y_{1})\)与\(B(x_{2},y_{2})\),如果满足\(x_{1}+x_{2}=0\),\(y_{1}-y_{2}=0\),其中\(x_{1}\neq x_{2}\),则称点\(A\)与点\(B\)互为反等点\(.\)已知:点\(C(3,4)\)
\((1)\)下列各点中, ______ 与点\(C\)互为反等点;
\(D(-3,-4)\),\(E(3,4)\),\(F(-3,4)\)
\((2)\)已知点\(G(-5,4)\),连接线段\(CG\),若在线段\(CG\)上存在两点\(P\),\(Q\)互为反等点,求点\(P\)的横坐标\(x_{P}\)的取值范围;
\((3)\)已知\(⊙O\)的半径为\(r\),若\(⊙O\)与\((2)\)中线段\(CG\)的两个交点互为反等点,求\(r\)的取值范围.