單項(xiàng)選擇題

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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單項(xiàng)選擇題

A coastal current（）.

A.is generated by waves striking the beach
B.flows outside the surf zone
C.flows in a circular pattern
D.is also known as a longshore current

單項(xiàng)選擇題

A backlash below a lock is defined as（）.

A.a current setting your vessel on the wall
B.a current setting into the lock chamber
C.an eddy working along the lower guide wall
D.a current setting counterclockwise