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两个圆C1:x2+y2+2x+2y-2=0与C2:x2+y2-4x-2y+1=0...
两个圆C1:x2+y2+2x+2y-2=0与C2:x2+y2-4x-2y+1=0的公切线有且仅有( )
A.1条
B.2条
C.3条
D.4条
考点分析:
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