单项选择题
The numeral in the center of a wind rose circle on a pilot chart indicates the （）.
A.total number of observations
B.average wind force on the Beaufort scale
C.average wind force in knots
D.percentage of calms
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单项选择题
The maximum difference between mean time and apparent time is （）.
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 -
单项选择题
The description Racon beside an illustration on a chart would mean a （）.
A.radar conspicuous beacon
B.circular radiobeacon
C.radar transponder beacon
D.radar calibration beacon -
单项选择题
The compass rose on a nautical chart indicates both variation and （）.
A.deviation
B.annual rate of variation change
C.precession
D.compass error
