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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The place where a channel moves from along one bank of the river over to the other bank of the river is called a（）.
In the Northern Hemisphere the major ocean currents tend to flow（）.
The horse latitudes are characterized by（）.
In some river mouths and estuaries the incoming high-tide wave crest overtakes the preceding low-tide trough. This results in a wall of water proceeding upstream，and is called a（）.
The drift and set of tidal，river，and ocean currents refer to the（）.
The apparent wind’s speed can be zero only when two conditions are present. One condition is that the true wind（）.
The direction of the surface wind is（）.
The height of a wave is the vertical distance（）.
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 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（）.