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
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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.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
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
最新試題
To make sure of getting the full advantage of a favorable current，you should reach an entrance or strait at what time in relation to the predicted time of the favorable current?（）
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（）.
The tide is（）.
Which statement is TRUE concerning apogean tides（）．
Spring tides are tides that（）.
Water may boil up around the stern of a vessel in a channel due to（）.
Tides are superimposed on nontidal rising and falling water levels，caused by（）．
The velocity of a rotary tidal current will be decreased when the Moon is（）.
The winds with the greatest effect on the set，drift，and depth of the equatorial currents are the（）.
Tide is（）in direction ENE.