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【单选题】
下图为一列沿 x 轴传播的横波在某时刻的波形图,波的频率为 4Hz ,此时质点 A 的运动方向沿 y 轴负向,则该波的传播方向及波速分别为A.
沿 x 轴正向， 8m/s
B.
沿 x 轴正向， 16m/s
C.
沿 x 轴负向， 8m/s
D.
沿 x 轴负向， 16m/s
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