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

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

A.deviation
B.annual rate of variation change
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The charts sold are of （）.

A.newly edition with up to date correction and in reasonable prices
B.the current edition and incorporate the last Notices to Mariners correction
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The chart symbol indicating that the bottom is coral is （）.

A.C
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