A.North Cape Current
B.Labrador Current
C.Greenland Current
D.North Atlantic Current
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A.must be from dead ahead
B.speed must be zero
C.must be from dead astern
D.must be on the beam
A.ahead and equal to the ship's speed
B.astern and equal to the ship's speed
C.ahead and equal to twice the ship's speed
D.astern and equal to twice the ship's speed
A.spring，around late evening
B.spring，around early evening
C.fall，around early morning
D.fall，around midday
A.always forms over water
B.is formed by a temperature inversion
C.is thinnest at the surface
D.dissipates during the evening
A.prevailing westerlies
B.geostrophic winds
C.doldrums
D.horse latitudes
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Low pressure disturbances，which travel along the intertropical convergence zone，are called（）.
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（）.
The apparent wind’s speed can be zero only when two conditions are present. One condition is that the true wind（）.
Advection fog is most commonly caused by（）.
Radiation fog（）.
In modern fathometers the sonic or ultrasonic sound waves are produced electrically by means of a(n)（）.
In the Northern Hemisphere，a wind that shifts counterclockwise is a（）.
Cold water flowing southward through the western part of the Bering Strait between Alaska and Siberia is joined by water circulating counterclockwise in the Bering Sea to form the（）.
In most cases，the direction of the apparent wind lies between the bow and（）.