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

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单项选择题

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

单项选择题

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

单项选择题

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