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
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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
A.Pick up speed where the channel widens
B.Run slower in the center of the channel
C.Hug the inside of a bend
D.Cause the greatest depth of water to be along the outside of a bend
A.at times of new and full Moon
B.when the Earth，Moon，and Sun are lying approximately on the same line
C.when the Moon is between first quarter and full and between third quarter and new
D.when the Moon is between new and first quarter and between full and third quarter
最新試題
The two most effective generating forces of surface ocean currents are（）.
Tides are superimposed on nontidal rising and falling water levels，caused by（）．
Stand of the tide is that time when（）.
The type of current which will have the greatest effect on the course made good for your vessel is（）.
Which statement is TRUE concerning equatorial tides（）.
The set of the current is 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（）.
The tide is（）.
Neap tides occur（）.
The steady current circling the globe at about 60°S is the（）.