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
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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
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
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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（）.
Radiation fog（）.
Low pressure disturbances，which travel along the intertropical convergence zone，are called（）.
The length of a wave is the length（）.
The cold ocean current which meets the warm Gulf Stream between latitudes 40°and 43°N to form the cold wall is called the（）.
In the Northern Hemisphere the major ocean currents tend to flow（）.
In most cases，the direction of the apparent wind lies between the bow and（）.
The apparent wind’s speed can be zero only when two conditions are present. One condition is that the true wind（）.
The horse latitudes are characterized by（）.
The drift and set of tidal，river，and ocean currents refer to the（）.