解：?$(1)$?∵點(diǎn)?$A(2，$??$a)$?與點(diǎn)?$B(b，$??$3)$?關(guān)于?$x$?軸對(duì)稱
∴?$b = 2，$??$a=-3$?
∴點(diǎn)?$C$?的坐標(biāo)為?$(-3，$??$2)$?
?$ (2)$?∵點(diǎn)?$C(-3，$??$2)，$?點(diǎn)?$C_{1}$?與點(diǎn)?$C$?關(guān)于?$y$?軸對(duì)稱
∴?$C_{1}(3，$??$2)$?
又∵點(diǎn)?$C_{2}$?與點(diǎn)?$C_{1}$?關(guān)于?$x$?軸對(duì)稱
∴?$C_{2}(3，$??$-2)$?
