A.spring，around late evening
B.spring，around early evening
C.fall，around early morning
D.fall，around midday
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A.always forms over water
B.is formed by a temperature inversion
C.is thinnest at the surface
D.dissipates during the evening
A.prevailing westerlies
B.geostrophic winds
C.doldrums
D.horse latitudes
A.create large waves in the direction of the current
B.change direction 360°during a 24 hour period
C.remain fairly constant in direction and velocity throughout the year
D.are characterized by a light green color
A.permanent waves
B.tidal waves
C.tropical waves
D.tropical storms
A.starboard bow，note the course，and head in that direction
B.starboard quarter，note the course，and head in that direction
C.port quarter，note the course，and head in that direction
D.port bow，note the course，and head in that direction
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The cold ocean current which meets the warm Gulf Stream between latitudes 40°and 43°N to form the cold wall is called the（）.
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)（）.
The height of a wave is the vertical distance（）.
A tide is called diurnal when（）.
In a tropical cyclone，in the Northern Hemisphere，a vessel hove to with the wind shifting counterclockwise is（）.
Advection fog is most commonly caused by（）.
Low pressure disturbances，which travel along the intertropical convergence zone，are called（）.
The edge of a hurricane has overtaken your vessel in the Gulf of Mexico，and the northwest wind of a few hours ago has shifted to the west. This is an indication that you are located in the（）.
In modern fathometers the sonic or ultrasonic sound waves are produced electrically by means of a(n)（）.
The presence of stratus clouds and a dying wind will usually result in（）.