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
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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.January
B.April
C.August
D.October
A.Effect of the moon's gravity
B.Fetch
C.Wind velocity
D.Length of time a wind has been blowing
A.adverse currents for practically the entire crossing
B.favorable currents for practically the entire crossing
C.favorable currents in the summer months and adverse currents in the winter months
D.variable currents having no significant effect on the total steaming time
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The speed of an ocean current is dependent on（）.
The Benguela Current flows in a（）.
The velocity of the wind，its steady direction，and the amount of time it has blown determines a wind driven current’s（）.
The tide（）.It’s 2 hours before low water，and（）your present position you will be aground at low water.
River currents tend to（）.
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（）.
The set of the current is the（）.
The velocity of a rotary tidal current will be decreased when the Moon is（）.
（）is not a type of tide.