A.wind direction remains steady
B.wind speed increases
C.barometer falls
D.All of the above
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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
A.a high pressure area
B.an extratropical cyclone
C.a tropical storm
D.an easterly wave
A.High pressure
B.Low pressure
C.Subsurface pressure
D.Terrastatic pressure
最新試題
The doldrums are characterized by（）.
The direction of prevailing winds in the Northern hemisphere is caused by the（）.
In the Northern Hemisphere，an observer at point II in the weather system should experience a wind shift from the（）.
The southeast trade winds actually blow toward the（）.
In the Southern Hemisphere winds in a low pressure system rotate in a（）.
Two well-developed high pressure areas may be separated by a（）.
Wen a hurricane passes over colder water or land and loses its tropical characteristics，the storm becomes a（n）（）.
Which condition indicates that you are in a hurricane’s dangerous semicircle in the Northern hemisphere（）.
Steady precipitation is typical of（）．
In the relatively calm area near the hurricane center，the seas are（）.