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【单选题】
曲线 f ( x , y )=0关于直线 x － y －2=0对称的曲线方程是
A.
f ( y +2, x )='0'
B.
f ( x －2, y )=0
C.
f ( y +2, x －2)='0'
D.
f ( y －2, x +2)=0
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