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
When there are small differences between the heights of two successive high tides or two successive low tides，the tides are called（）.
You are docking a vessel．Wind and current are most favorable when they are（）.
The velocity of a rotary tidal current will be decreased when the Moon is（）.
Tide is（）in direction ENE.
（）is not a type of tide.
Tides are superimposed on nontidal rising and falling water levels，caused by（）．
Priming of the tides occurs（）.
When daylight savings time is kept，the time of tide and current calculations must be adjusted.One way of doing this is to（）.
Neap tides occur only（）.
The tide（）.It’s 2 hours before low water，and（）your present position you will be aground at low water.