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
The velocity of the wind，its steady direction，and the amount of time it has blown determines a wind driven current’s（）.
Which current is responsible for the movement of icebergs into the North Atlantic shipping lanes（）.
When there are small differences between the heights of two successive high tides or two successive low tides，the tides are called（）.
The type of current which will have the greatest effect on the course made good for your vessel is（）.
The steady current circling the globe at about 60°S is the（）.
Which current would you encounter on a direct passage from London，England，to Capetown，South Africa（）.
The tide is（）.
Tides are superimposed on nontidal rising and falling water levels，caused by（）．
Neap tides occur when the（）.
Which statement is TRUE concerning equatorial tides（）.