單項選擇題When there are small differences between the heights of two successive high tides or two successive low tides，the tides are called（）.

A.Diurna
B.Semi-diurnal
C.Solar
D.Mixed


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1.單項選擇題When daylight savings time is kept，the time of tide and current calculations must be adjusted.One way of doing this is to（）.

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

2.單項選擇題Tides are superimposed on nontidal rising and falling water levels，caused by（）．

A.freshets
B.floods
C.river flows
D.seismic events

3.單項選擇題The set of the current is the（）.

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

4.單項選擇題The Benguela Current flows in a（）.

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

5.單項選擇題Stand of the tide is that time when（）.

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