试题与答案

过抛物线y2=2px(p>0)的焦点F的直线与抛物线相交于M,N两点,自M,N向

题型:选择题

题目:

过抛物线y2=2px(p>0)的焦点F的直线与抛物线相交于M,N两点,自M,N向准线l作垂线,垂足分别为M1,N1,则∠M1FN1等于(  )
A.45°B.60°C.90°D.120°

答案:

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