A.at right angles to the flow of the current
B.against the flow of the current
C.in the same direction as the flow of the current
D.over slack water
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A.weak pressure gradients and light，variable winds
B.the formation of typhoons or hurricanes in certain seasons
C.steady winds in one direction for six months followed by wind reversal for the next six months
D.steady winds generally from the southeast in the Southern Hemisphere
A.from the still water plane to the crest
B.from the still water plane to the trough
C.from crest to trough
D.between water levels at one-quarter of the wave's length
A.navigable semicircle
B.dangerous semicircle
C.low pressure area
D.eye of the storm
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
最新試題
In the Northern Hemisphere，a wind that shifts counterclockwise is a（）.
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（）.
Radiation fog（）.
The presence of stratus clouds and a dying wind will usually result in（）.
Steam fog is most likely to occur on the Mississippi and Ohio Rivers in（）.
The height of a wave is the vertical distance（）.
A tide is called diurnal when（）.
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 horse latitudes are characterized by（）.