A market specialization strategy involves a firm which finds one market segment very attractive, and hence that segment a variety of different products. ( )
A.
正确
B.
错误
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【简答题】已知定点F(2,0),动圆P经过点F且与直线x=-2相切,记动圆的圆心P的轨迹为C. (Ⅰ)求轨迹C的方程; (Ⅱ)过点F作倾斜角为60°的直线l与轨迹C交于A(x 1 ,y 1 )、B(x 1 ,y 2 )两点,O为坐标原点,点M为轨迹C上一点,若向量 OM = OA +λ OB ,求λ的值.