题干
帮图片选择合适的句子
A. Open the door.
B. Turn on the light.
C. Clean the window.
D. Put up the picture.
E. Clean the board.
F. Sweep the floor.
____
____
____
____
____
____
A. Open the door.
B. Turn on the light.
C. Clean the window.
D. Put up the picture.
E. Clean the board.
F. Sweep the floor.
____ ____ ____ ____ ____ ____
答案(点此获取答案解析）
B,A,F,C,D,E
、
双曲线
的两焦点，O是坐标原点，直线AB过
轴，并与双曲线交于A、B两点，若
，则双曲线的离心率
（ ）