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
Stand of the tide is that time when（）.
The set of the current is the（）.
You are docking a vessel．Wind and current are most favorable when they are（）.
The two most effective generating forces of surface ocean currents are（）.
The tide（）.It’s 2 hours before low water，and（）your present position you will be aground at low water.
Which current would you encounter on a direct passage from London，England，to Capetown，South Africa（）.
Neap tides occur when the（）.
The velocity of the current in large coastal harbors is（）.
Tropic tides are caused by the（）.
When daylight savings time is kept，the time of tide and current calculations must be adjusted.One way of doing this is to（）.