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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The doldrums are characterized by（）.
Which condition indicates that you are in a hurricane’s dangerous semicircle in the Northern hemisphere（）.
The passing of a low pressure system can be determined by periodically checking the（）.
What kind of conditions would you observe as the eye of a storm passes over your ship’s position（）.
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（）.
When experiencing heavy winds，you should reef sails to（）.
If you observe the point of cloud convergence shifting to the right and the “bar”of the storm appears to move along the horizon（）.
In the Northern Hemisphere a wind is said to veer when the wind（）.
Your facsimile prognostic chart indicates that you will cross the cold front of a low pressure system in about 24 hours.You should（）.
In the Northern Hemisphere，an observer at point II in the weather system should experience a wind shift from the（）.