A.equatorial current
B.humidity
C.rotation of the earth
D.change of seasons
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A.from
B.on
C.in
D.of
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
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In the Northern Hemisphere，a wind that shifts counterclockwise is a（）.
The direction of the southeast trade winds is a result of the（）.
Low pressure disturbances，which travel along the intertropical convergence zone，are called（）.
The height of a wave is the vertical distance（）.
In the Northern Hemisphere，your vessel is believed to be in the direct path of a hurricane，and plenty of sea room is available. The best course of action is to bring the wind on 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 apparent wind’s speed can be zero only when two conditions are present. One condition is that the true wind（）.
The apparent wind can be zero when the true wind is from（）.
The presence of stratus clouds and a dying wind will usually result in（）.
The edge of a hurricane has overtaken your vessel in the Gulf of Mexico，and the northwest wind of a few hours ago has shifted to the west. This is an indication that you are located in the（）.