A.Diurna
B.Semi-diurnal
C.Solar
D.Mixed
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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
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
最新試題
The tide（）.It’s 2 hours before low water，and（）your present position you will be aground at low water.
The Benguela Current flows in a（）.
The two most effective generating forces of surface ocean currents are（）.
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?（）
Neap tides occur when the（）.
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（）.
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（）.
Tide is（）in direction ENE.
Tropic tides are caused by the（）.