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.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
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The two most effective generating forces of surface ocean currents are（）.
The term flood current refers to that time when the water（）.
Priming of the tides occurs（）.
The tide（）.It’s 2 hours before low water，and（）your present position you will be aground at low water.
Tropic tides are caused by the（）.
The winds with the greatest effect on the set，drift，and depth of the equatorial currents are the（）.
The steady current circling the globe at about 60°S is the（）.
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（）.
River currents tend to（）.
Neap tides occur when the（）.