A.air being warmed above the dew point
B.saturation of cold air by rain
C.a rapid cooling of the air near the surface of the Earth at night
D.warm moist air being blown over a colder surface
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A.Northwest
B.Southeast
C.Northeast
D.Southwest
A.only one high and one low water occur during a lunar day
B.the high tide is higher and the low tide is lower than usual
C.the high tide and low tide are exactly six hours apart
D.two high tides occur during a lunar day
A.hydraulic current
B.rectilinear current
C.rotary current
D.harmonic current
A.Papagayo
B.fall wind
C.foehn
D.williwaw
A.Tehuan tepecer
B.Papagayo
C.Norther
D.Pampero
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The currents are（）mosoonal origin．
In the Northern Hemisphere the major ocean currents tend to flow（）.
The length of a wave is the length（）.
In the Northern Hemisphere you are caught in the dangerous semicircle with plenty of sea room available. The best course of action is to bring the wind on the（）.
In modern fathometers the sonic or ultrasonic sound waves are produced electrically by means of a(n)（）.
On the pole side of the trade wind belt，there is an area of high pressure with weak pressure gradients and light，variable winds. This area is called the（）.
The presence of stratus clouds and a dying wind will usually result in（）.
In some parts of the world there is often a slight fall in tide during the middle of the high water period. The effect is to create a longer period of stand at higher water. This special feature is called a(n)（）.
In shallow water，waves that are too steep to be stable，causing the crests to move forward faster than the rest of the wave，are called（）.
In a tropical cyclone，in the Northern Hemisphere，a vessel hove to with the wind shifting counterclockwise is（）.