A.chute
B.stabilized channel
C.slough
D.navigable pass
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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
A.small whirlpool
B.smooth patch of water
C.V-shaped ripple with the point of the V pointing downstream
D.V-shaped ripple with the point of the V pointing upstream
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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（）.
The height of a wave is the vertical distance（）.
The direction of the surface wind is（）.
In most cases，the direction of the apparent wind lies between the bow and（）.
In mid-ocean，the characteristics of a wave are determined by three factors. What is NOT one of these factors?（）.
The cold ocean current which meets the warm Gulf Stream between latitudes 40°and 43°N to form the cold wall is called the（）.
Low pressure disturbances，which travel along the intertropical convergence zone，are called（）.
The currents are（）mosoonal origin．
The length of a wave is the length（）.
In the Northern Hemisphere the major ocean currents tend to flow（）.