A.slack water when upbound
B.shallow water
C.a cross current
D.a head current
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A.Moon being at its maximum declination
B.Moon crossing the equator
C.Sun and Moon both being near 0°declination
D.Moon being at perigee
A.One hour after the predicted time
B.At the predicted time
C.30 minutes before flood，one hour after an ebb
D.30 minutes before the predicted time
A.getting
B.setting
C.being
D.having
A.doldrums
B.horse latitudes
C.trade winds
D.prevailing westerlies
A.temperature
B.density
C.deflection
D.speed
最新試題
The term flood current refers to that time when the water（）.
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（）.
Which statement is TRUE concerning equatorial tides（）.
Tides are superimposed on nontidal rising and falling water levels，caused by（）．
Neap tides occur only（）.
The Benguela Current flows in a（）.
The velocity of the current in large coastal harbors is（）.
River currents tend to（）.
The type of current which will have the greatest effect on the course made good for your vessel is（）.
The two most effective generating forces of surface ocean currents are（）.