A.when the moon is new or full
B.when the moon and sun have declination of the same name
C.only when the moon and sun are on the same sides of the earth
D.at the beginning of spring when the sun is over the equator
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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 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
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
最新試題
The term flood current refers to that time when the water（）.
Which current would you encounter on a direct passage from southern Africa to Argentina，South America（）.
Water may boil up around the stern of a vessel in a channel due to（）.
The type of current which will have the greatest effect on the course made good for your vessel is（）.
The Benguela Current flows in a（）.
Tides are superimposed on nontidal rising and falling water levels，caused by（）．
River currents tend to（）.
Priming of the tides occurs（）.
The velocity of a rotary tidal current will be decreased when the Moon is（）.
The tide is（）.