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【单选题】
已知椭圆的两个焦点为 F 1 (- 5 ，0) ， F 2 ( 5 ，0) ，M是椭圆上一点，若 M F 1 ? M F 2 =0 ， | M F 1 |?| M F 2 |=8 ，则该椭圆的方程是（ ）A.
x 2 7 + y 2 2 =1
B.
x 2 2 + y 2 7 =1
C.
x 2 9 + y 2 4 =1
D.
x 2 4 + y 2 9 =1
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A.
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B.
为防正出血事件的发生，尿激酶溶栓后不可使用肝素类药物
C.
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A.
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B.
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C.
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A.
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B.
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D.
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E.
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