单项选择题
The navigational term SET OF CURRENT means（）.
A.velocity of current in knots
B.direction from which the current flows
C.estimated current
D.direction toward which the current flows
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A.reversing current
B.ebb current
C.flood current
D.slack current -
单项选择题
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
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单项选择题
The Humboldt Current flows in which direction?（）
A.North
B.South
C.East
D.West
