The officer of the watch should use radar when appropriate and at all times in（）waters.

The fitting of an efficient radar reflector is likely to considerably increase the ship’s probability of（）.

A.detection
B.being detected
C.the detective
D.the detected

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The description Racon beside an illustration on a chart would mean a（）.

A.radar transponder beacon
B.radar conspicuous beacon
C.radar calibration beacon
D.circular radiobeacon

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