A.d≥5                                                        B.3≤d≤5

C.0≤d≤5                                                   D.0＜d≤5

A.(－1，－3)                                            B.(17，－9)

C.(－1，3)                                              D.(－17，9)

A.AB＞0且C≠1                                              B.AB＜0且C≠1

C.A²＋B²≠0且C≠1                                       D.A=B=C=1

①θ₁=θ₂l₁∥l₂  ②|θ₁－θ₂|=90°l₁⊥l₂　③若l₁、l₂都过原点，且θ₁＋θ₂=π,则l₁和l₂关于y轴对称  ④若l₁、l₂都过原点，且θ₁＋θ₂=0°,则l₁和l₂关于x轴对称

A.1                                                             B.2     

C.3                                                             D.4

A.平行                                                   B.重合

C.平行或重合                                          D.相交或重合

(1)直线l₁过点(－3，－1)，并且直线l₁与直线l₂垂直;

(2)直线l₁与直线l₂平行，并且坐标原点到l₁、l₂的距离相等.