A.Add one hour to the times listed under the reference stations
B.Subtract one hour from the time differences listed for the subordinate stations
C.Apply no correction as the times in the reference stations are adjusted for daylight savings time
D.Add 15° to the standard meridian when calculating the time difference
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A.freshets
B.floods
C.river flows
D.seismic events
A.speed of the current at a particular time
B.maximum speed of the current
C.direction from which the current flows
D.direction in which the current flows
A.SW'ly direction along the NW coast of Africa
B.S'ly direction off the East Coast of Australia
C.NW'ly direction along the SW coast of Africa
D.SW'ly direction along the SE coast of Greenland
A.the vertical rise or fall of the tide has stopped
B.slack water occurs
C.tidal current is at a maximum
D.the actual depth of the water equals the charted depth
A.have lows lower than normal and highs higher than normal
B.have lows higher than normal and highs lower than normal
C.are unpredictable
D.occur in the spring of the year
最新試題
The Benguela Current flows in a（）.
The velocity of a rotary tidal current will be decreased when the Moon is（）.
Which current would you encounter on a direct passage from London，England，to Capetown，South Africa（）.
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?（）
When daylight savings time is kept，the time of tide and current calculations must be adjusted.One way of doing this is to（）.
Neap tides occur only（）.
Tides are superimposed on nontidal rising and falling water levels，caused by（）．
Tide is（）in direction ENE.
The tide is（）.
The two most effective generating forces of surface ocean currents are（）.