The center of gravity is the point an airplane would balance if suspended 重心是飞机悬空时保持平衡 的点
A.If an airplane is suspended, if would balance at the point called the center of gravity. B.The center of gravity is the point of an airplane; it would hardly balance if suspended. C.If an airplane is hung; it wouldn't balance at the point called the center of gravity.正确答案A
