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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In the Northern Hemisphere the major ocean currents tend to flow（）.
The apparent wind’s speed can be zero only when two conditions are present. One condition is that the true wind（）.
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)（）.
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 direction of the southeast trade winds is a result of the（）.
The length of a wave is the length（）.
The largest waves (heaviest chop) will usually develop where the wind blows（）.
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 shallow water，waves that are too steep to be stable，causing the crests to move forward faster than the rest of the wave，are called（）.
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)（）.