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.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.shallow water
B.deep water
C.river
D.tide
A.SEMIDIURNAL
B.DIURNAL
C.MIXED
D.OSCILLATING
最新試題
The term flood current refers to that time when the water（）.
Priming of the tides occurs（）.
Water may boil up around the stern of a vessel in a channel due to（）.
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?（）
The tide（）.It’s 2 hours before low water，and（）your present position you will be aground at low water.
Neap tides occur only（）.
River currents tend to（）.
The tide is（）.
When there are small differences between the heights of two successive high tides or two successive low tides，the tides are called（）.
Which statement is TRUE concerning apogean tides（）．