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
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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
A.predicted in Tidal Current Tables
B.unpredictable
C.generally constant
D.generally too weak to be of concern
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The Benguela Current flows in a（）.
Which current is responsible for the movement of icebergs into the North Atlantic shipping lanes（）.
The winds with the greatest effect on the set，drift，and depth of the equatorial currents are the（）.
Spring tides are tides that（）.
The set of the current is the（）.
A wave entering（）is likely to produce bores．
Which current would you encounter on a direct passage from southern Africa to Argentina，South America（）.
The velocity of a rotary tidal current will be decreased when the Moon is（）.
The tide（）.It’s 2 hours before low water，and（）your present position you will be aground at low water.
When daylight savings time is kept，the time of tide and current calculations must be adjusted.One way of doing this is to（）.