单选题A V-shaped ripple with the point of the V pointing upstream in a river may indicate a（）.Asubmerged rock，not dangerous to navigationBsunken wreck，not dangerous to navigationCtowed-under buoyDAll of the above
单选题
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
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