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
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Steam fog is most likely to occur on the Mississippi and Ohio Rivers in（）.
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（）.
Radiation fog（）.
Advection fog is most commonly caused by（）.
The presence of stratus clouds and a dying wind will usually result in（）.
The length of a wave is the length（）.
Advection fog holds longest over which portions of the lakes?（）
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（）.
A tide is called diurnal when（）.
The direction of the surface wind is（）.