A.SW'ly direction along the NW coast of Africa
B.S'ly direction off the East Coast of Australia
C.NW'ly direction along the SW coast of Africa
D.SW'ly direction along the SE coast of Greenland
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A.the vertical rise or fall of the tide has stopped
B.slack water occurs
C.tidal current is at a maximum
D.the actual depth of the water equals the charted depth
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.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
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
最新試題
The set of the current is the（）.
The velocity of a rotary tidal current will be decreased when the Moon is（）.
Stand of the tide is that time when（）.
The speed of an ocean current is dependent on（）.
Water may boil up around the stern of a vessel in a channel due to（）.
Neap tides occur only（）.
River currents tend to（）.
When daylight savings time is kept，the time of tide and current calculations must be adjusted.One way of doing this is to（）.
Spring tides are tides that（）.
Which current is responsible for the movement of icebergs into the North Atlantic shipping lanes（）.