A.Course-planning
B.Position-fixing
C.Radar-plotting
D.Stowage-plan making
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A.frequent
B.so frequent
C.frequent that
D.so frequent that
A.To consider
B.To check
C.To examine
D.To agree with
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
最新試題
Charts showing the coast of Mexico are produced by the United States（）.
The survey information upon which a chart is based is found （）.
The maximum difference between mean time and apparent time is （）.
When navigating in high latitudes and using a chart based on a Lambert conformal projection，（）.
（）is not a position-fixing system.
What information is found in the chart title? （）
A chart position enclosed by a square is a（n）（）.
The short-long dashed，magenta lines parallel to York River Entrance Channel mark（）．
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（）.
Which aid is NOT marked on a chart with a magenta circle? （）