單項(xiàng)選擇題

The movement of water away from the shore or downstream is called a(n)（）.

A.reversing current
B.ebb current
C.flood current
D.slack current

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單項(xiàng)選擇題

The interval of the average elapsed time from the meridian transit of the moon until the next high tide is called the（）.

A.harmonic constant
B.establishment of the port
C.half-tide level
D.tide cycle

單項(xiàng)選擇題

The Humboldt Current flows in which direction?（）

A.North
B.South
C.East
D.West