The author of the report is well _____ with theproblems in the hospital because he has been working there for many years. A. acquainted B. informed C.enlightened D. advised
【简答题】已知抛物线的顶点在坐标原点O,焦点F在x轴正半轴上,倾斜角为锐角的直线l过F点,设直线l与抛物线交于A、B两点,与抛物线的准线交于M点, MF =λ FB (λ>0) (1)若λ=1,求直线l斜率 (2)若点A、B在x轴上的射影分别为A 1 ,B 1 且| B 1 F |,| OF |,2| A 1 F |成等差数列求λ的值 (3)设已知抛物线为C1:y 2 =x,将其绕顶点按逆时针方向旋转90°...