A.doldrums
B.horse latitudes
C.trade winds
D.prevailing westerlies
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A.temperature
B.density
C.deflection
D.speed
A.predicted in Tidal Current Tables
B.unpredictable
C.generally constant
D.generally too weak to be of concern
A.at apogee
B.new
C.full
D.All of the above
A.one flowing in the same direction as your course steered
B.one flowing in the opposite direction as your course steered
C.one that flows at nearly right angles to your course steered
D.a rotary current in which the direction of current flow constantly changes
A.temperature and salinity differences in the water
B.wind and density differences in the water
C.water depth and underwater topography
D.rotation of the Earth and continental interference
最新試題
Tides are superimposed on nontidal rising and falling water levels，caused by（）．
The winds with the greatest effect on the set，drift，and depth of the equatorial currents are the（）.
The steady current circling the globe at about 60°S is the（）.
To make sure of getting the full advantage of a favorable current，you should reach an entrance or strait at what time in relation to the predicted time of the favorable current?（）
Tide is（）in direction ENE.
The tide（）.It’s 2 hours before low water，and（）your present position you will be aground at low water.
The velocity of the wind，its steady direction，and the amount of time it has blown determines a wind driven current’s（）.
Water may boil up around the stern of a vessel in a channel due to（）.
Neap tides occur（）.
Which current would you encounter on a direct passage from southern Africa to Argentina，South America（）.