A.its velocity in knots
B.direction from which it flows
C.estimated current
D.direction toward which it flows
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A.interruption of the normal current flow by the footing
B.elevating in mud-slide zones
C.penetrating rapidly through a hard crust into weaker soils
D.extracting legs from soils with high cohesion
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
A.in an area of high density the water's surface is lower than in an area of low density
B.surface water flows from an area of high density to one of low density
C.the lesser the density gradient the freer the water is to move
D.it is the density differences that cause the currents to stay in the troughs
A.Moon is in its first quarter and third quarter phases
B.Sun and Moon are on opposite sides of the Earth
C.Moon's declination is maximum and opposite to that of the Sun
D.Sun and Moon are in conjunction
最新試題
Water may boil up around the stern of a vessel in a channel due to（）.
Tides are superimposed on nontidal rising and falling water levels，caused by（）．
Priming of the tides occurs（）.
Which statement is TRUE concerning equatorial tides（）.
The speed of an ocean current is dependent on（）.
The type of current which will have the greatest effect on the course made good for your vessel is（）.
The velocity of the wind，its steady direction，and the amount of time it has blown determines a wind driven current’s（）.
（）is not a type of tide.
Tropic tides are caused by the（）.
To make sure of getting the full advantage of a favorable current，you should reach an entrance or strait at what time in relation to the predicted time of the favorable current?（）