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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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
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The height of a wave is the vertical distance（）.
In most cases，the direction of the apparent wind lies between the bow and（）.
The apparent wind can be zero when the true wind is from（）.
Advection fog is most commonly caused by（）.
The drift and set of tidal，river，and ocean currents refer to the（）.
In the Northern Hemisphere，a wind that shifts counterclockwise is a（）.
In modern fathometers the sonic or ultrasonic sound waves are produced electrically by means of a(n)（）.
The direction of the southeast trade winds is a result of the（）.
On the pole side of the trade wind belt，there is an area of high pressure with weak pressure gradients and light，variable winds. This area is called the（）.
In mid-ocean，the characteristics of a wave are determined by three factors. What is NOT one of these factors?（）.