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
最新試題
Steam fog is most likely to occur on the Mississippi and Ohio Rivers in（）.
In a tropical cyclone，in the Northern Hemisphere，a vessel hove to with the wind shifting counterclockwise is（）.
In shallow water，waves that are too steep to be stable，causing the crests to move forward faster than the rest of the wave，are called（）.
In mid-ocean，the characteristics of a wave are determined by three factors. What is NOT one of these factors?（）.
The presence of stratus clouds and a dying wind will usually result in（）.
The apparent wind’s speed can be zero only when two conditions are present. One condition is that the true wind（）.
The currents are（）mosoonal origin．
The height of a wave is the vertical distance（）.
Ocean currents are well defined and（）.
Advection fog holds longest over which portions of the lakes?（）