單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

The compass rose on a nautical chart indicates both variation and （）.

A.deviation
B.annual rate of variation change
C.precession
D.compass error