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【单选题】
下列说法正确的是(    )
A.
若直线l 1 与l 2 斜率相等，则l 1 ∥l 2
B.
若直线l 1 ∥l 2 ，则k 1 =k 2 ,
C.
若直线l 1 ,l 2 的斜率不存在，则l 1 ∥l 2
D.
若两条直线的斜率不相等，则两直线不平行
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