单项选择题

Radar reflectors are required for（）.……

Radar reflectors are required for（）.

A.all fishing vessels over 39 feet in length
B.sail-propelled fishing vessels
C.all fishing vessels of less than 200 GT
D.wooden hull fishing vessels with a poor radar echo

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热门试题

单项选择题PPI is（）.

A.a plan-position indicator system
B.pulse-plan integration
C.pulse-pulse input
D.power-plan input

单项选择题Although manual plotting for CPA works well，the workload can become overwhelming when confronted with（）.

A.one target
B.two targets
C.three targets
D.a large number of targets

单项选择题（）typically extends from close as 0.1 nautical miles out to 32 NM.

A.EBL
B.VRM
C.CRT
D.target tracking range

单项选择题（）is not used in modern radar.

A.EBL
B.VRM
C.CRT
D.Grease pencil

单项选择题（）is not a job of the radar antenna.

A.To receive the high-frequency pulses from the transmitter
B.To focus the pulses into a beam，and send them into space
C.To pick up reflected pulses coming from objects that have been struck by the beam
D.To reflect microwaves