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
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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
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
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（）．
Which current is responsible for the movement of icebergs into the North Atlantic shipping lanes（）.
Water may boil up around the stern of a vessel in a channel due to（）.
A wave entering（）is likely to produce bores．
The steady current circling the globe at about 60°S is the（）.
The speed of an ocean current is dependent on（）.
The set of the current is the（）.
The term flood current refers to that time when the water（）.
River currents tend to（）.