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（）．
Priming of the tides occurs（）.
When there are small differences between the heights of two successive high tides or two successive low tides，the tides are called（）.
The type of current which will have the greatest effect on the course made good for your vessel is（）.
Tide is（）in direction ENE.
Neap tides occur（）.
Neap tides occur only（）.
Tropic tides are caused by 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?（）
You are anchoring in a river where the current is from one direction only.The best way to lay out two anchors is to have them（）.