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
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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（）.
The horse latitudes are characterized by（）.
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（）.
Low pressure disturbances，which travel along the intertropical convergence zone，are called（）.
A tide is called diurnal when（）.
The largest waves (heaviest chop) will usually develop where the wind blows（）.
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 cold ocean current which meets the warm Gulf Stream between latitudes 40°and 43°N to form the cold wall is called the（）.
The apparent wind’s speed can be zero only when two conditions are present. One condition is that the true wind（）.
In most cases，the direction of the apparent wind lies between the bow and（）.