A.abyssal plain
B.continental shelf
C.borderland
D.offshore terrace
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A.of the wave's crest
B.of the wave's trough
C.measured from crest to trough
D.measured from crest to crest
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
最新試題
The drift and set of tidal，river，and ocean currents refer to the（）.
In the Northern Hemisphere the major ocean currents tend to flow（）.
A swift current occurring in a narrow passage connecting two large bodies of water which is produced by the continuously changing difference in height of tide at the two ends of the passage is called a(n)（）.
In the Northern Hemisphere，your vessel is believed to be in the direct path of a hurricane，and plenty of sea room is available. The best course of action is to bring the wind on the（）.
Advection fog is most commonly caused by（）.
A tide is called diurnal when（）.
Steam fog is most likely to occur on the Mississippi and Ohio Rivers in（）.
The direction of the surface wind is（）.
The place where a channel moves from along one bank of the river over to the other bank of the river is called a（）.
In the Northern Hemisphere，a wind that shifts counterclockwise is a（）.