A.at high vessel speeds
B.at low vessel speeds
C.in shallow water
D.in deep water
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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
A.is generated by waves striking the beach
B.flows outside the surf zone
C.flows in a circular pattern
D.is also known as a longshore current
A.a current setting your vessel on the wall
B.a current setting into the lock chamber
C.an eddy working along the lower guide wall
D.a current setting counterclockwise
最新試題
The horse latitudes are characterized by（）.
The presence of stratus clouds and a dying wind will usually result in（）.
In the Northern Hemisphere，a wind that shifts counterclockwise is a（）.
Radiation fog（）.
Ocean currents are well defined and（）.
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（）.
Advection fog holds longest over which portions of the lakes?（）
The place where a channel moves from along one bank of the river over to the other bank of the river is called a（）.
In most cases，the direction of the apparent wind lies between the bow and（）.
The height of a wave is the vertical distance（）.