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两直线A1x+B1y+C1=0,A2x+B2y+C2=0垂直的充要条件是（ ）
A．= -1 B．A1A2-B1B2=0 C．A1A2+B1B2=0 D．
两条直线A1x+B1y+C1=0,A2x+B2y+C2=0垂直的充要条件是
A.A1A2+B1B2=0 B.A1A2－B1B2=0
C.=－1 D.=－1
A.A1A2+B1B2=0 B.A1A2－B1B2=0 C.=－1 D.=－1
A.A1A2+B1B2=0 B.A1A2-B1B2=0 C.=-1 D.=1
= -1 B．A1A2-B1B2=0 C．A1A2+B1B2=0 D．
=－1 D.
=－1
=－1
=－1
=－1 D.
=－1
=-1 D.
=1