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


参考解析

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名词解释题波纹/波痕(ripple)

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