—What did you eat last night?
— [ ]
A. Yes, I did.
B. No, I didn't.
C. Hamburgers.
答案:C
已知直线l⊥平面α,直线mÍ平面β,则下列四个命题:
①若α∥β,则l⊥m; ②若α⊥β,则l∥m;
③若l∥m,则α⊥β; ④若l⊥m,则α∥β.
其中正确命题的序号是
已知直线l与圆x2+y2+2x=0相切于点T,且与双曲线x2-y2=1相交于A、B两点.若T是线段AB的中点,求直线l的方程.