25.已知抛物线y2=8xy^{2}=8xy2=8x的焦点为FFF,准线与xxx轴的交点为CCC,过点CCC的直线lll与抛物线交于AAA,BBB两点,若∠AFB=∠CFB\angle AFB=\angle CFB∠AFB=∠CFB,则∣AF∣=\vert AF\vert =∣AF∣=[ 8 ].