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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

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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