A.from
B.on
C.in
D.of
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A.North Cape Current
B.Labrador Current
C.Greenland Current
D.North Atlantic Current
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
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Advection fog is most commonly caused by（）.
In shallow water，waves that are too steep to be stable，causing the crests to move forward faster than the rest of the wave，are called（）.
The horse latitudes are characterized by（）.
In mid-ocean，the characteristics of a wave are determined by three factors. What is NOT one of these factors?（）.
The direction of the southeast trade winds is a result of the（）.
In some river mouths and estuaries the incoming high-tide wave crest overtakes the preceding low-tide trough. This results in a wall of water proceeding upstream，and is called a（）.
The cold ocean current which meets the warm Gulf Stream between latitudes 40°and 43°N to form the cold wall is called the（）.
The apparent wind’s speed can be zero only when two conditions are present. One condition is that the true wind（）.
In most cases，the direction of the apparent wind lies between the bow and（）.
The largest waves (heaviest chop) will usually develop where the wind blows（）.