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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A.chute
B.stabilized channel
C.slough
D.navigable pass
A.3 hours
B.6 1/2 hours
C.12 1/2 hours
D.25 hours
A.dew
B.frost
C.glaze
D.snow
A.high density will be on the left in the Northern Hemisphere
B.high density will be on the right in the Southern Hemisphere
C.low density will be on the left in the Northern Hemisphere
D.low density will be on the left in the Southern Hemisphere
A.at high vessel speeds
B.at low vessel speeds
C.in shallow water
D.in deep water
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Radiation fog（）.
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 currents are（）mosoonal origin．
In the Northern Hemisphere，a wind that shifts counterclockwise is a（）.
Advection fog holds longest over which portions of the lakes?（）
A tide is called diurnal when（）.
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)（）.
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 length of a wave is the length（）.
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（）.