(08年岳阳一中二模理) P为四棱锥S-ABCD的面SBC内一点,若动点P到

08年岳阳一中二模理)

P为四棱锥SABCD的面SBC内一点,若动点P到平面ABC的距离与到点S的距离相等,则动点P的轨迹是面SBC内的

A、线段或圆的一部分                            B、双曲线或椭圆的一部分

C、双曲线或抛物线的一部分                  D、抛物线或椭圆的一部分

答案

答案:D

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