A.rollers
B.breakers
C.white caps
D.surfers
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A.the direction of the true wind
B.true north
C.the beam on the windward side
D.the beam on the lee side
A.transmitter
B.transducer
C.transceiver
D.amplifier
A.Effect of the moon's gravity
B.Fetch
C.Wind velocity
D.Length of time a wind has been blowing
A.ahead of the storm center
B.in the dangerous semicircle
C.in the navigable semicircle
D.directly in the approach path of the storm
A.Alaska Current
B.Subarctic Current
C.Kuroshio Current
D.Oyashio Current
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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（）.
The height of a wave is the vertical distance（）.
The presence of stratus clouds and a dying wind will usually result in（）.
In the Northern Hemisphere，a wind that shifts counterclockwise is a（）.
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)（）.
Advection fog is most commonly caused by（）.
The largest waves (heaviest chop) will usually develop where the wind blows（）.
Radiation fog（）.
The currents are（）mosoonal origin．
In modern fathometers the sonic or ultrasonic sound waves are produced electrically by means of a(n)（）.