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过抛物线y2=4x的焦点作直线l交抛物线于A、B两点,若线段AB中点的横坐标为3...
过抛物线y2=4x的焦点作直线l交抛物线于A、B两点,若线段AB中点的横坐标为3,则|AB|等于( )
A.2
B.4
C.6
D.8
考点分析:
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