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双曲线-=1的渐近线与圆(x-3)2+y2=r2(r>0)相切,则r= ( ) ...

双曲线说明: 6ec8aac122bd4f6e-说明: 6ec8aac122bd4f6e=1的渐近线与圆(x-3)2+y2=r2(r>0)相切,则r=                        (    )

       A.说明: 6ec8aac122bd4f6e说明: 6ec8aac122bd4f6e              B.2                    C.3                     D.6

 

A 【解析】略
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