A.of the wave's crest
B.of the wave's trough
C.measured from crest to trough
D.measured from crest to crest
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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
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
最新試題
In mid-ocean，the characteristics of a wave are determined by three factors. What is NOT one of these factors?（）.
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（）.
In most cases，the direction of the apparent wind lies between the bow and（）.
Low pressure disturbances，which travel along the intertropical convergence zone，are called（）.
The length of a wave is the length（）.
The currents are（）mosoonal origin．
A tide is called diurnal when（）.
The largest waves (heaviest chop) will usually develop where the wind blows（）.
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（）.
The presence of stratus clouds and a dying wind will usually result in（）.