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单选题
Heights are expressed（）meters above mean high water.
A
in
B
on
C
by
D
with
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Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean ______.A.lower low waterB.high waterC.low waterD.sea level
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The maximum difference between mean time and apparent time is ______.A.equal to the longitude expressed in time unitsB.about 16 minutesC.the difference between the GHA of mean sun and the first point of AriesD.15°of arc
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The soundings on the chart are based on the depth of water available at ______.A.mean low waterB.mean lower low waterC.mean high waterD.mean high water springs
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The heights and soundings of Admiralty chart are expressed ______ in Fathoms ______ in Meters．A.either，orB.neither，norC.another，norD.other，or
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Contour elevations on this chart refer to heights in feet above mean ______.A.lower low waterB.high waterC.low waterD.sea level
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The datum from which the predicted heights of tides are reckoned in the tide tables is ______.A.mean low waterB.the same as that used for the charts of the localityC.the highest possible levelD.given in table three of the tide tables
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The average height of the surface of the sea for all stages of the tide over a 19 year period is called ______.A.mean high waterB.mean low waterC.half-tide levelD.mean sea level
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The reference datum used in determining the heights of land features on most charts is ______.A.mean sea levelB.mean high waterC.mean low waterD.half-tide level
考题
The latest known details of lights are given in ______．A.gives daily predictions of the times and heights of high and low water for a selection of Standard PortsB.lists the principal harmonic constants for all those ports where they are known，for use for prediction by the Simplified Harmonic Method of Tidal PredictionC.is a comprehensive guide for the yachtsmanD.permits the mariner to select and simultaneously calculate tidal heights for multiple ports for up to seven days
考题
In what units are heights and soundings in the chart? They are in ______.A.meters and fathomsB.fathoms and metersC.meter and fathomD.fathom and meter
考题
Mean high water is the average height of ______.A.the higher high watersB.the lower high watersC.the lower of the two daily tidesD.all high waters
考题
Send the headline down to 2 meters above water. （）A、把头缆送到离水面2米。B、把水上的头缆挪前2米。C、把水中的头缆挪前2米。D、把头缆往水中挪前2米。
考题
Which of the following options describes Segment Shrink？（） A、 Reclaims space above and below the high-water mark without using additional spaceB、 Moves rows to a new physical location，resetting the high-water mark，but uses additional space during the operationC、 Deallocates space above the high-water mark that is currently not in useD、 None of the above
考题
单选题The reference datum used in determining the heights of land features on most charts is（）.A
mean sea levelB
mean high waterC
mean low waterD
half-tide level
考题
单选题The heights and soundings of Admiralty chart are expressed（）in Fathoms（）in Meters．A
either，orB
neither，norC
another，norD
other，or
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单选题When there are small differences between the heights of two successive high tides or two successive low tides，the tides are called（）.A
DiurnaB
Semi-diurnalC
SolarD
Mixed
考题
单选题The maximum difference between mean time and apparent time is （）.A
equal to the longitude expressed in time unitsB
about 16 minutesC
the difference between the GHA of mean sun and the first point of AriesD
15°of arc
考题
单选题Send the headline down to 2 meters above water. （）A
把头缆送到离水面2米。B
把水上的头缆挪前2米。C
把水中的头缆挪前2米。D
把头缆往水中挪前2米。
考题
单选题Contour elevations on this chart refer to heights in feet above mean （）.A
lower low waterB
high waterC
low waterD
sea level
考题
单选题Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean （）.A
lower low waterB
high waterC
low waterD
sea level
考题
单选题The difference between the heights of low and high tide is the（）.A
periodB
rangeC
distanceD
depth
考题
单选题某张英版海图的海图标题栏内有如下注记：“all heights are above Mean Heigh Water Springs.”则表明该图（）。A
高程基准面为平均大潮高潮面B
高程基准面为平均天文潮面C
水深基准面为平均大潮高潮面D
高程基准面为平均高高潮面
考题
单选题Which of the following options describes Segment Shrink？（）A
Reclaims space above and below the high-water mark without using additional spaceB
Moves rows to a new physical location，resetting the high-water mark，but uses additional space during the operationC
Deallocates space above the high-water mark that is currently not in useD
None of the above
考题
单选题The latest known details of lights are given in（）.A
gives daily predictions of the times and heights of high and low water for a selection of Standard PortsB
lists the principal harmonic constants for all those ports where they are known，for use for prediction by the Simplified Harmonic Method of Tidal PredictionC
is a comprehensive guide for the yachtsmanD
permits the mariner to select and simultaneously calculate tidal heights for multiple ports for up to seven days
考题
单选题Mean high water is the average height of（）.A
The higher high watersB
The lower high watersC
The lower of the two daily tidesD
All high waters
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