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
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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
A.at a new or full Moon
B.when the Sun，Moon，and Earth are in line
C.at approximately 28-day intervals
D.when the Moon is at quadrature
A.at the start of spring，when the Sun is nearly over the equator
B.only when the Sun and Moon are on the same sides of the Earth and are nearly in line
C.when the Sun and Moon are at approximately 90°to each other，as seen from the Earth
D.when the Sun，Moon，and Earth are nearly in line，regardless of alignment order
A.January
B.April
C.August
D.October
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Priming of the tides occurs（）.
Which current is responsible for the movement of icebergs into the North Atlantic shipping lanes（）.
When daylight savings time is kept，the time of tide and current calculations must be adjusted.One way of doing this is to（）.
The velocity of the current in large coastal harbors is（）.
The term flood current refers to that time when the water（）.
Neap tides occur only（）.
Tide is（）in direction ENE.
Tides are superimposed on nontidal rising and falling water levels，caused by（）．
You are docking a vessel．Wind and current are most favorable when they are（）.
Which current would you encounter on a direct passage from London，England，to Capetown，South Africa（）.