已知直线与直线互相垂直，则（） A. －1 B. �

已知直线与直线互相垂直，则（）

A. －1 B. C. 1 D. 4

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已知直线与直线互相垂直，则（ ） A. －1 B. �

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已知直线与直线互相垂直，则（） A. －1 B. �