、直线3x + 4y + 2 = 0与圆x2 + y2 + 4x = 0交于A,B两点,则线段AB的垂直平分线的方程是A 4x-3y-2 = 0 B 4x-3y-6 = 0 C 4x + 3y + 6 = 0 D 4x + 3y + 8 = 0

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