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已知:向量,,曲线上一点P到点F(3,0)的距离为6,M为PF的中点,O为坐标原...
已知:向量
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,
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,曲线
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上一点P到点F(3,0)的距离为6,M为PF的中点,O为坐标原点,则|OM|=( )
A.1
B.2
C.5
D.1或5
考点分析:
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