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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A.directly from high pressure toward low pressure
B.directly from low pressure toward high pressure
C.from high pressure toward low pressure deflected by the earth's rotation
D.from low pressure toward high pressure deflected by the earth's rotation
A.equatorial current
B.humidity
C.rotation of the earth
D.change of seasons
A.from
B.on
C.in
D.of
A.North Cape Current
B.Labrador Current
C.Greenland Current
D.North Atlantic Current
A.must be from dead ahead
B.speed must be zero
C.must be from dead astern
D.must be on the beam
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In mid-ocean，the characteristics of a wave are determined by three factors. What is NOT one of these factors?（）.
The apparent wind’s speed can be zero only when two conditions are present. One condition is that the true wind（）.
The largest waves (heaviest chop) will usually develop where the wind blows（）.
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 horse latitudes are characterized by（）.
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 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（）.
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)（）.
The length of a wave is the length（）.
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)（）.