如图所示\( ,\)正方体的三个面所在平面\( {A}_{1}{C}_{1},{A}_{1}B,{B}_{1}C,\)分别记作\( a,\beta ,\gamma ,\)试用适当的符号填空.
(1)\( {A}_{1}\)______\( \alpha ,{B}_{1}\)______\( \alpha \)；
(2)\( {B}_{1}\_\_\_\_\_\_\gamma ,{C}_{1}\)______\( \gamma ,{D}_{1}\)______\( \beta ；={A}_{1}{B}_{2}\);
(3)\( \alpha \_\_\_\_\_\_\beta ={A}_{1}{B}_{2}\);
(4)\( {A}_{1}{B}_{1}\_\_\_\_\_\_\alpha ,B{B}_{1}\_\_\_\_\_\_\beta ,\beta \_\_\_\_\_\_\gamma =B{B}_{1}\).
