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
When there are small differences between the heights of two successive high tides or two successive low tides，the tides are called（）.
Priming of the tides occurs（）.
The set of the current is the（）.
The steady current circling the globe at about 60°S is the（）.
The two most effective generating forces of surface ocean currents are（）.
The tide is（）.
The Benguela Current flows in a（）.
Which statement is TRUE concerning equatorial tides（）.
Tropic tides are caused by the（）.
Water may boil up around the stern of a vessel in a channel due to（）.