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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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