A.cylindrical projection
B.simple conic projection
C.polyconic projection
D.rectangular projection
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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
A.Gray lines on the uppermost inset chart
B.Red lines on the main body of the chart
C.In parenthesis on the lines of equal magnetic variation
D.Annual rate of change is not shown
最新試題
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（）.
（）is not a position-fixing system.
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（）.
The numeral in the center of a wind rose circle on a pilot chart indicates the （）.
The arrangement of charts in the catalogue is（）.
The soundings on the chart are based on the depth of water available at （）.
On chart，bearings to near objects should be used in preference to objects farther off，because（）.
The survey information upon which a chart is based is found （）.
That the scale of any part of a chart to be larger than the scale of the survey is（）.