A condition where two currents meet at the downstream end of a middle bar can be determined by a（）.<br>A:small whirlpool<br>B:smooth patch of water<br>C:V-shaped ripple with the point of the V pointing downstream<br>D:V-shaped ripple with the point of the V pointing upstream

A condition where two currents meet at the downstream end of a middle bar can be determined by a（）.
A:small whirlpool
B:smooth patch of water
C:V-shaped ripple with the point of the V pointing downstream
D:V-shaped ripple with the point of the V pointing upstream

出自：海船船员证

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