A.low barometric pressure
B.high barometric pressure
C.falling barometric pressure
D.pumping barometric pressure
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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
A.Upwind
B.Downwind
C.Crosswind
D.Downcurrent
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MIST is caused by（）.
The strong wind will make us（）here for some days.
What is the first visible indication of the presence of a tropical cyclone or hurricane（）.
Wen a hurricane passes over colder water or land and loses its tropical characteristics，the storm becomes a（n）（）.
In the Northern Hemisphere，if your vessel is in a hurricane’s navigable semicircle it should be positioned with the wind on the（）.
Which of the following is not a wind（）.
In regions near the poles，the winds are generally described as（）.
The southeast trade winds actually blow toward the（）.
Steady precipitation is typical of（）．
When experiencing heavy winds，you should reef sails to（）.