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设抛物线的焦点为F(-2,0),则抛物线的标准方程是( ) A.y2=-8 B....
设抛物线的焦点为F(-2,0),则抛物线的标准方程是( )
A.y2=-8
B.x2=-8y
C.y2=-4
D.x2=-4y
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