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
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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
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
最新試題
The Benguela Current flows in a（）.
The set of the current is the（）.
The tide（）.It’s 2 hours before low water，and（）your present position you will be aground at low water.
Spring tides are tides that（）.
The term flood current refers to that time when the water（）.
（）is not a type of tide.
The tide is（）.
The steady current circling the globe at about 60°S is the（）.
Which current would you encounter on a direct passage from southern Africa to Argentina，South America（）.
Water may boil up around the stern of a vessel in a channel due to（）.