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
River currents tend to（）.
The term flood current refers to that time when the water（）.
The speed of an ocean current is dependent on（）.
The two most effective generating forces of surface ocean currents are（）.
Tropic tides are caused by the（）.
When daylight savings time is kept，the time of tide and current calculations must be adjusted.One way of doing this is to（）.
The tide（）.It’s 2 hours before low water，and（）your present position you will be aground at low water.
Which current would you encounter on a direct passage from southern Africa to Argentina，South America（）.
Which current is responsible for the movement of icebergs into the North Atlantic shipping lanes（）.
Which statement is TRUE concerning equatorial tides（）.