A.mean low water
B.mean lower low water
C.mean high water
D.mean high water springs
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A.Top center
B.Lower-left corner
C.Part of the chart title
D.Any clear area around the neat line
A.DR plot
B.track line
C.heading
D.estimated course
A.Lambert conformal
B.Mercator
C.azimuthal
D.gnomonic
A.total number of observations
B.average wind force on the Beaufort scale
C.average wind force in knots
D.percentage of calms
A.equal to the longitude expressed in time units
B.about 16 minutes
C.the difference between the GHA of mean sun and the first point of Aries
D.15°of arc
最新試題
Every chart is liable to be incomplete（）.
The survey information upon which a chart is based is found （）.
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?（）
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，（）.
（）is not a position-fixing system.
What defines a great circle? （）
The only cylindrical chart projection widely used for navigation is the （）.
Which chart symbol indicates the bottom is clay（）.
The shoreline on charts generally represents the mean（）.