A V-shaped ripple with the point of the V pointing upstream in a river may indicate a（）.<br>A:submerged rock, not dangerous to navigation<br>B:sunken wreck, not dangerous to navigation<br>C:towed-under buoy<br>D:All of the above

A V-shaped ripple with the point of the V pointing upstream in a river may indicate a（）.
A:submerged rock, not dangerous to navigation
B:sunken wreck, not dangerous to navigation
C:towed-under buoy
D:All of the above

出自：海船船员证

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