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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The direction of prevailing winds in the Northern hemisphere is caused by the（）.
When your vessel is on or near the path of an approaching tropical storm the（）.
In the Northern Hemisphere，the right half of the storm is known as the dangerous semicircle because（）.
Monsoons are characterized by（）.
When a tornado moves over the water from land it is called a（）.
If you observe the point of cloud convergence shifting to the right and the “bar”of the storm appears to move along the horizon（）.
What is the first visible indication of the presence of a tropical cyclone or hurricane（）.
Two well-developed high pressure areas may be separated by a（）.
In the relatively calm area near the hurricane center，the seas are（）.
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（）.