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
On a Mercator chart，1 nautical mile is equal to（）.
The path that a vessel is expected to follow，represented on a chart by a line drawn from the point of departure to the point of arrival，is the（）.
On chart，bearings to near objects should be used in preference to objects farther off，because（）.
Where would you obtain data on currents for areas of the world not covered by the National Ocean Service（）.
The soundings on the chart are based on the depth of water available at （）.
What is NOT an advantage of the rhumb line track over a great circle track? （）
A chart with a scale of 1:80，000 would fall into the category of a（）.
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（）.
The broken magenta lines（long and short dashes）in and around Mobjack Bay indicate（）.