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 Benguela Current flows in a（）.
A wave entering（）is likely to produce bores．
Which statement is TRUE concerning equatorial tides（）.
You are anchoring in a river where the current is from one direction only.The best way to lay out two anchors is to have them（）.
The velocity of a rotary tidal current will be decreased when the Moon is（）.
The set of the current is the（）.
Spring tides are tides that（）.
Neap tides occur（）.
The velocity of the wind，its steady direction，and the amount of time it has blown determines a wind driven current’s（）.
You are docking a vessel．Wind and current are most favorable when they are（）.