单项选择题
To determine if risk of collision exists，a vessel which is fitted with radar must use（）.
A.radar scanning
B.radar plotting
C.compass bearings
D.All of the above
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相关考题
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单项选择题
The shoreline along Rocky Point should give a good radar return because（）.
A.the shore is bluff and rocky
B.of offshore exposed rocks
C.submerged reefs cause prominent breakers
D.the lookout tower is marked with radar reflectors -
单项选择题
The radio waves used for radar are very short，only（）long.
A.a few centimeters
B.a few fathoms
C.a few meters
D.a few feet -
单项选择题
The radar control used to reduce sea return at close ranges is the（）.
A.gain control
B.sensitivity time control
C.fast time constant
D.pulse length control
