單項(xiàng)選擇題

A current perpendicular to a vessel’s track has the greatest effect on the vessel’s course made good（）.

A.at high vessel speeds
B.at low vessel speeds
C.in shallow water
D.in deep water

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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

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