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
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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
A.equatorial current
B.humidity
C.rotation of the earth
D.change of seasons
A.from
B.on
C.in
D.of
最新試題
The apparent wind can be zero when the true wind is from（）.
In a tropical cyclone，in the Northern Hemisphere，a vessel hove to with the wind shifting counterclockwise is（）.
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 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 ocean bottom that extends from the shoreline out to an area where there is a marked change in slope to a greater depth is the（）.
In mid-ocean，the characteristics of a wave are determined by three factors. What is NOT one of these factors?（）.
The presence of stratus clouds and a dying wind will usually result in（）.
The drift and set of tidal，river，and ocean currents refer to the（）.
In most cases，the direction of the apparent wind lies between the bow and（）.
The length of a wave is the length（）.