单项选择题
The radar control that reduces weak echoes out to a limited distance from the ship is the（）.
A.sensitivity time control (sea-clutter control)
B.receiver gain control
C.brilliance control
D.fast time constant (differentiator)
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单项选择题
The officer of the watch should use radar when appropriate and at all times in（）waters.
A.congesting
B.congested
C.congestion
D.congest -
单项选择题
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
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单项选择题
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
