A.cirrus
B.cirrocumulus
C.altostratus
D.cumulonimbus
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A.low barometric pressure
B.high barometric pressure
C.falling barometric pressure
D.pumping barometric pressure
A.high pressures
B.low pressures
C.weak pressures
D.strong pressures
A.check it with a barometer on another vessel
B.take readings from several barometers and average them
C.check it with the barometer at the ship chandlery
D.check it against radio or National Weather Service reports of the immediate vicinity
A.a certain area
B.all ocean areas
C.some areas
D.important areas
A.distance a wave travels between formation and decay
B.stretch of water over which a wave-forming wind blows
C.time in seconds required for two crests to pass a given point
D.measurement of a wave's steepness
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Tropical cyclones are classified by form and intensity.Which system does not have closed isobars（）.
When a hurricane passes into high latitudes over colder water and the source of heat is disrupted，the storm assumes the characteristics of（）.
The doldrums are characterized by（）.
Which condition suggests that your present position lies in the navigable semicircle of a tropical storm（）.
You have determined that you are in the right semicircle of a tropical cyclone in the Northern Hemisphere.What action should you take to avoid the storm（）.
Which condition indicates that you are in a hurricane’s dangerous semicircle in the Northern hemisphere（）.
Your facsimile prognostic chart indicates that you will cross the cold front of a low pressure system in about 24 hours.You should（）.
What kind of pressure systems travel in easterly waves（）.
In the Northern Hemisphere，an observer at point II in the weather system should experience a wind shift from the（）.
Two well-developed high pressure areas may be separated by a（）.