(本题满分12分)设 A ( x , y )、 B ( x , y ) 是椭圆 ( a > b > 0) 上的两点, , = ( , ),且满足 · = 0,椭圆的离心率 e = ,短轴长为2, O 为坐标原点.(1)求椭圆的方程;(2)若存在斜率为 k 的直线 AB 过椭圆的焦点 F (0, c )( c 为半焦距),求直线 AB 的斜率 k 的值.
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【单选题】According to the passage, Japanese firms differ strikingly from American firms in that the former ______.
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