A.x+y+2=0 B.x-y+2=0 C.x+y-2=0 D.x-y-2

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问题 A.x+y+2=0B.x-y+2=0C.x+y-2=0D.x-y-2=0

选项 A.x+y+2=0
B.x-y+2=0
C.x+y-2=0
D.x-y-2=0

答案 A

解析
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