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 side of the Earth and 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，in any order
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A.have lows lower than normal and highs higher than normal
B.have lows higher than normal and highs lower than normal
C.are unpredictable
D.occur in the spring of the year
A.its velocity in knots
B.direction from which it flows
C.estimated current
D.direction toward which it flows
A.interruption of the normal current flow by the footing
B.elevating in mud-slide zones
C.penetrating rapidly through a hard crust into weaker soils
D.extracting legs from soils with high cohesion
A.pick up speed where the channel widens
B.run slower in the center of the channel
C.hug the inside of a bend
D.cause the greatest depth of water to be along the outside of a bend
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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Stand of the tide is that time when（）.
The winds with the greatest effect on the set，drift，and depth of the equatorial currents are the（）.
Which current would you encounter on a direct passage from southern Africa to Argentina，South America（）.
The velocity of a rotary tidal current will be decreased when the Moon is（）.
When daylight savings time is kept，the time of tide and current calculations must be adjusted.One way of doing this is to（）.
The term flood current refers to that time when the water（）.
Spring tides are tides that（）.
Water may boil up around the stern of a vessel in a channel due to（）.
Neap tides occur only（）.
Neap tides occur when the（）.