A.A backing wind
B.A veering wind
C.Sustained gale force winds
D.A strong wind that maintains a constant speed and direction
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A.A backing wind
B.A veering wind
C.A norther
D.A strong，gusty wind
A.wind direction remains steady
B.wind speed increases
C.barometer falls
D.All of the above
A.bring the sails parallel to the wind
B.reduce sail area exposed to the wind
C.allow the sails to catch more wind
D.remove all tension on the main and jib sheets
A.Tornado
B.Waterspout
C.Hurricane
D.Cyclone
A.High pressure area
B.Extratropical low-pressure system
C.Tropical storm
D.Easterly wave
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In regions near the poles，the winds are generally described as（）.
The southeast trade winds actually blow toward the（）.
Wen a hurricane passes over colder water or land and loses its tropical characteristics，the storm becomes a（n）（）.
Two well-developed high pressure areas may be separated by a（）.
In the Northern Hemisphere，when the wind at your location is northerly，the low pressure center causing the wind is located to your（）.
Your facsimile prognostic chart indicates that you will cross the cold front of a low pressure system in about 24 hours.You should（）.
Which condition suggests that your present position lies in the navigable semicircle of a tropical storm（）.
What is the first visible indication of the presence of a tropical cyclone or hurricane（）.
In the Southern Hemisphere winds in a low pressure system rotate in a（）.
Tropical cyclones are classified by form and intensity.Which system does not have closed isobars（）.