A snag or other underwater obstruction may form a（）.<br>A:V-shaped ripple with the point of the V pointing upstream<br>B:V-shaped ripple with the point of the V pointing downstream<br>C:small patch of smooth water on a windy day<br>D:smoothing out of the vessel's wake

A snag or other underwater obstruction may form a（）.
A:V-shaped ripple with the point of the V pointing upstream
B:V-shaped ripple with the point of the V pointing downstream
C:small patch of smooth water on a windy day
D:smoothing out of the vessel's wake

出自：海船船员证

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