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
A wave entering（）is likely to produce bores．
The winds with the greatest effect on the set，drift，and depth of the equatorial currents are the（）.
The set of the current is the（）.
The tide is（）.
The steady current circling the globe at about 60°S is the（）.
Neap tides occur only（）.
Stand of the tide is that time when（）.
Tropic tides are caused by the（）.
Neap tides occur（）.
Water may boil up around the stern of a vessel in a channel due to（）.