A.navigable semicircle
B.dangerous semicircle
C.low pressure area
D.eye of the storm
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A.position and area of the current
B.speed and direction toward which the current flows
C.type and characteristic of the current's flow
D.None of the above
A.directly from high pressure toward low pressure
B.directly from low pressure toward high pressure
C.from high pressure toward low pressure deflected by the earth's rotation
D.from low pressure toward high pressure deflected by the earth's rotation
A.equatorial current
B.humidity
C.rotation of the earth
D.change of seasons
A.from
B.on
C.in
D.of
A.North Cape Current
B.Labrador Current
C.Greenland Current
D.North Atlantic Current
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A tide is called diurnal when（）.
The length of a wave is the length（）.
The largest waves (heaviest chop) will usually develop where the wind blows（）.
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)（）.
Ocean currents are well defined and（）.
The cold ocean current which meets the warm Gulf Stream between latitudes 40°and 43°N to form the cold wall is called the（）.
The direction of the southeast trade winds is a result of the（）.
Cold water flowing southward through the western part of the Bering Strait between Alaska and Siberia is joined by water circulating counterclockwise in the Bering Sea to form the（）.
The presence of stratus clouds and a dying wind will usually result in（）.
In modern fathometers the sonic or ultrasonic sound waves are produced electrically by means of a(n)（）.