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
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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.seiche
B.bore
C.boundary wave
D.surge
A.apogean tide
B.double high water
C.perigean tide
D.bore
A.rollers
B.breakers
C.white caps
D.surfers
A.the direction of the true wind
B.true north
C.the beam on the windward side
D.the beam on the lee side
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The height of a wave is the vertical distance（）.
In the Northern Hemisphere you are caught in the dangerous semicircle with plenty of sea room available. The best course of action is to bring the wind on the（）.
The cold ocean current which meets the warm Gulf Stream between latitudes 40°and 43°N to form the cold wall is called the（）.
The length of a wave is the length（）.
Low pressure disturbances，which travel along the intertropical convergence zone，are called（）.
Ocean currents are well defined and（）.
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 direction of the surface wind 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（）.
Steam fog is most likely to occur on the Mississippi and Ohio Rivers in（）.