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
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A.shallow water
B.deep water
C.river
D.tide
A.SEMIDIURNAL
B.DIURNAL
C.MIXED
D.OSCILLATING
A.slack water when upbound
B.shallow water
C.a cross current
D.a head current
A.Moon being at its maximum declination
B.Moon crossing the equator
C.Sun and Moon both being near 0°declination
D.Moon being at perigee
A.One hour after the predicted time
B.At the predicted time
C.30 minutes before flood，one hour after an ebb
D.30 minutes before the predicted time
最新試題
Tides are superimposed on nontidal rising and falling water levels，caused by（）．
Neap tides occur（）.
Which current would you encounter on a direct passage from southern Africa to Argentina，South America（）.
The velocity of the wind，its steady direction，and the amount of time it has blown determines a wind driven current’s（）.
The velocity of the current in large coastal harbors is（）.
The two most effective generating forces of surface ocean currents are（）.
The speed of an ocean current is dependent on（）.
The winds with the greatest effect on the set，drift，and depth of the equatorial currents are the（）.
Spring tides are tides that（）.
The type of current which will have the greatest effect on the course made good for your vessel is（）.