A.3 hours
B.6 1/2 hours
C.12 1/2 hours
D.25 hours
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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
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
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A tide is called diurnal when（）.
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（）.
The length of a wave is the length（）.
The apparent wind’s speed can be zero only when two conditions are present. One condition is that the true wind（）.
In modern fathometers the sonic or ultrasonic sound waves are produced electrically by means of a(n)（）.
Radiation fog（）.
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（）.
In the Northern Hemisphere，a wind that shifts counterclockwise is a（）.
Advection fog holds longest over which portions of the lakes?（）
Advection fog is most commonly caused by（）.