如图6所示，实线是沿x轴传播的一列简谐横波在t=0时刻的波形图，虚

如图6所示，实线是沿x轴传播的一列简谐横波在t=0时刻的波形图，虚线是这列波在t-=0．2 s 时刻的波形图。已知该波的波速是0.8 m/s，下列说法正确的是（）

A．这列波的波长是14 cm

B．这列波的周期是0.15 s

C．这列波可能是沿x轴正方向传播的

D．t=0时，x=4 cm处的质点速度沿y轴正方向

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如图6所示，实线是沿x轴传播的一列简谐横波在t=0时刻的波形图，虚

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