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
单项选择题 The movement of water away from the shore or downstream is called a(n)（）.
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（）.
单项选择题 The Humboldt Current flows in which direction?（）
