A.a current setting your vessel on the wall
B.a current setting into the lock chamber
C.an eddy working along the lower guide wall
D.a current setting counterclockwise
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A.Alaska Current
B.Subarctic Current
C.Kuroshio Current
D.Oyashio Current
A.prevailing westerlies
B.geostrophic winds
C.doldrums
D.horse latitudes
A.spring，around late evening
B.spring，around early evening
C.fall，around early morning
D.fall，around midday
A.clockwise around the North Atlantic and North Pacific Oceans
B.clockwise or counterclockwise depending on whether it is warm or cold current
C.counterclockwise except in the Gulf Stream
D.counterclockwise around the North Atlantic and North Pacific Oceans
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.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.starboard bow and make as much headway as possible
B.starboard quarter，and make as much headway as possible
C.port quarter，and make as much headway as possible
D.port bow，and make as much headway as possible
A.must be from dead ahead
B.speed must be zero
C.must be from dead astern
D.must be on the beam
A.abyssal plain
B.continental shelf
C.borderland
D.offshore terrace
最新試題
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)（）.
The direction of the southeast trade winds is a result of the（）.
The presence of stratus clouds and a dying wind will usually result in（）.
In the Northern Hemisphere，a wind that shifts counterclockwise is a（）.
Low pressure disturbances，which travel along the intertropical convergence zone，are called（）.
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 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（）.
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 currents are（）mosoonal origin．
The height of a wave is the vertical distance（）.