A.are tracked on reciprocal bearings
B.are tracked at the same range
C.are tracked on the same bearing
D.pass close together
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A.give better range performance in rain，hail，etc
B.display small targets in a mass of dense sea clutter at a greater range
C.have less sea return in choppy rough seas
D.display a more map like presentation for inshore navigation
A.be more suitable for river and harbor navigation
B.provide better range performance on low lying targets during good weather and calm seas
C.have a wider horizontal beam width
D.have more sea return during rough sea conditions
A.sweep introduction
B.sweep interest
C.sweep intention
D.sweep intensity
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
A.in dense fog
B.in boisterous weather
C.in the open sea
D.in rivers
最新試題
Radar reflectors are required for（）.
You are scanning the radar screen for a buoy fitted with racon. How should this signal appear on the PPI display?（）
Your ARPA has been tracking a target and has generated the targets course and speed.The radar did not receive a target echo on its last two scans due to the weather.What should you expect under these circumstances（）.
When hitting a solid object such as a ship or an airplane，the radar waves are reflected back （）they came.
What provides little or no indication that a vessel is dragging anchor? （）
Although manual plotting for CPA works well，the workload can become overwhelming when confronted with（）.
What will cause the ARPA to emit a visual alarm，audible alarm，or both?（）
Which statement is true concerning a vessel equipped with operational radar?（）.
When navigating in thick fog with the radar on，you should（）.
Your radar displays your ship off center．As you proceed on your course， your ship’s marker moves on the PPI scope while echoes from land masses remain stationary.What is this display called（）.