A.heavy rain
B.heavy snow
C.thick fog
D.clearing skies
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A.draft
B.cutoff
C.draw
D.crossing
A.abyssal plain
B.continental shelf
C.borderland
D.offshore terrace
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
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The apparent wind’s speed can be zero only when two conditions are present. One condition is that the true wind（）.
Radiation fog（）.
The length of a wave is the length（）.
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（）.
The direction of the surface wind is（）.
Steam fog is most likely to occur on the Mississippi and Ohio Rivers in（）.
In most cases，the direction of the apparent wind lies between the bow and（）.
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（）.
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（）.
The drift and set of tidal，river，and ocean currents refer to the（）.