一个余弦横波沿 x 轴负向传播, t 时刻波形曲线如图所示。试分别指出图中 A 、 B 两质点在该时刻的运动方向: A 质点 向 y 轴 ____ 方向运动; B 质点 向 y 轴 ____ 方向运动。(填正或负)
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