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设双曲线的-个焦点为F;虚轴的-个端点为B,如果直线FB与该双曲线的一条渐近线垂...
设双曲线的-个焦点为F;虚轴的-个端点为B,如果直线FB与该双曲线的一条渐近线垂直,那么此双曲线的离心率为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225157519090834/SYS201311012251575190908011_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225157519090834/SYS201311012251575190908011_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225157519090834/SYS201311012251575190908011_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225157519090834/SYS201311012251575190908011_ST/3.png)
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