A.only one high and one low water occur during a lunar day
B.the high tide is higher and the low tide is lower than usual
C.the high tide and low tide are exactly six hours apart
D.two high tides occur during a lunar day
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A.hydraulic current
B.rectilinear current
C.rotary current
D.harmonic current
A.Papagayo
B.fall wind
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D.williwaw
A.Tehuan tepecer
B.Papagayo
C.Norther
D.Pampero
A.crossing
B.transit
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D.passing
A.V-shaped ripple with the point of the V pointing upstream
B.V-shaped ripple with the point of the V pointing downstream
C.small patch of smooth water on a windy day
D.smoothing out of the vessel's wake
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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（）.
Ocean currents are well defined and（）.
The height of a wave is the vertical distance（）.
Advection fog is most commonly caused by（）.
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)（）.
In the Northern Hemisphere，a wind that shifts counterclockwise is a（）.
On the pole side of the trade wind belt，there is an area of high pressure with weak pressure gradients and light，variable winds. This area is called the（）.
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（）.
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 the Northern Hemisphere，your vessel is believed to be in the direct path of a hurricane，and plenty of sea room is available. The best course of action is to bring the wind on the（）.