试题与答案

若动圆与圆(x-2 )2+y2=1 相外切,又与直线x+1=0 相切,则动圆圆心

题型:选择题

题目:

若动圆与圆(x-2 )2+y2=1 相外切,又与直线x+1=0 相切,则动圆圆心的轨迹是  [ ]

A.椭圆            

B.双曲线  

C.双曲线的一支    

D.抛物线

答案:

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