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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�、廴�l₁、l₂都過原點，且θ₁＋θ₂=π,則l₁和l₂關(guān)于y軸對稱  ④若l₁、l₂都過原點，且θ₁＋θ₂=0°,則l₁和l₂關(guān)于x軸對稱

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)直線l₁過點(－3，－1)，并且直線l₁與直線l₂垂直;

(2)直線l₁與直線l₂平行，并且坐標(biāo)原點到l₁、l₂的距離相等.