A.To consider
B.To check
C.To examine
D.To agree with
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A.cylindrical projection
B.simple conic projection
C.polyconic projection
D.rectangular projection
A.after every major hydrographic survey of the area covered by the chart
B.when there are numerous corrections to be made or the corrections are extensive
C.when a low-stock situation occurs and minor corrections are made
D.every two years to update the magnetic variation information
A.Mercator projection
B.polyconic projection
C.orthographic projection
D.gnomonic projection
A.Summary of Corrections
B.Local Notice to Mariners
C.Daily Memorandum
D.Chart Correction Card
A.vertical distance from the chart sounding datum to the ocean bottom，plus the height of tide
B.vertical distance from the chart sounding datum to the ocean bottom
C.average height of water over a specified period of time
D.average height of all low waters at a place
最新試題
Where would you obtain data on currents for areas of the world not covered by the National Ocean Service（）.
A chart projection depicting the poles and a small area on either side of a connecting meridian，that is sometimes used for star charts，is the（）.
When a buoy is in position only during a certain period of the year，where may the dates when the buoy is in position be found?（）
Particular care is needed when navigating in the vicinity of（）as very few of these features have been fully surveyed to modern standards to determine their correct position，full extent，or the least depth over them.
（）is not a position-fixing system.
Which aid is NOT marked on a chart with a magenta circle? （）
When navigating in high latitudes and using a chart based on a Lambert conformal projection，（）.
A chart position enclosed by a square is a（n）（）.
When using a Lambert conformal chart in high latitudes，angles such as bearings are measured in reference to （）.
That the scale of any part of a chart to be larger than the scale of the survey is（）.