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若直线l1:ax+2y+6=0与直线l2:x+(a-1)y+(a2-1)=0平行...
若直线l1:ax+2y+6=0与直线l2:x+(a-1)y+(a2-1)=0平行且不重合,则a的值是
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B.2条
C.3条
D.4条
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