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1 . 已知
:x2+y2+4x=0,
:x2+y2-4y=0,下列说法中正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9e69fd92eceb49fed10c4b50723d13d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17f7ba050bb69ab55bdcb96f935f5922.png)
A.直线x+y+2=0平分![]() |
B.过点P(2,0)引![]() ![]() |
C.![]() ![]() |
D.存在k∈R,使![]() |
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