A.A backing wind
B.A veering wind
C.A norther
D.A strong，gusty wind
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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
A.a high pressure area
B.an extratropical cyclone
C.a tropical storm
D.an easterly wave
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Which condition indicates that you are in a hurricane’s dangerous semicircle in the Northern hemisphere（）.
Which type of precipitation is a product of the violent convection found in thunderstorms（）.
Which of the following is not a wind（）.
The passing of a low pressure system can be determined by periodically checking the（）.
Your facsimile prognostic chart indicates that you will cross the cold front of a low pressure system in about 24 hours.You should（）.
In regions near the poles，the winds are generally described as（）.
In the Northern Hemisphere，when the wind at your location is northerly，the low pressure center causing the wind is located to your（）.
If you observe the point of cloud convergence shifting to the right and the “bar”of the storm appears to move along the horizon（）.
The force resulting from the earth’s rotation that causes winds to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere is called（）.
The direction of prevailing winds in the Northern hemisphere is caused by the（）.