单项选择题

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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单项选择题

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

单项选择题

Tides are superimposed on nontidal rising and falling water levels，caused by（）．

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

单项选择题

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