A.2x-y-1=0 B.2x+y-1=0 C.2x-y+1=0 D.2x

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问题 A.2x-y-1=0B.2x+y-1=0C.2x-y+1=0D.2x+y+1=0

选项 A.2x-y-1=0
B.2x+y-1=0
C.2x-y+1=0
D.2x+y+1=0

答案 B

解析
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