单项选择题

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

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A coastal current（）.

A.is generated by waves striking the beach
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C.flows in a circular pattern
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单项选择题

A backlash below a lock is defined as（）.

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