单项选择题
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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相关考题
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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
