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
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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（）.
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（）.
In the Northern Hemisphere，a wind that shifts counterclockwise is a（）.
In the Northern Hemisphere the major ocean currents tend to flow（）.
Steam fog is most likely to occur on the Mississippi and Ohio Rivers in（）.
A tide is called diurnal when（）.
The apparent wind’s speed can be zero only when two conditions are present. One condition is that the true wind（）.
The place where a channel moves from along one bank of the river over to the other bank of the river is called a（）.
The currents are（）mosoonal origin．