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
（）is not used in modern radar.
The（）has a built-in world map; most areas are displayed on a scale of 4000 nm from the top to the bottom of the screen，and can be zoomed in to 150 nm.
Which statement is TRUE concerning a vessel equipped with operational radar?（）.
You are using a radar in which your own ship is shown at the center，and the heading flash always points to 0°. If bearings are measured in relation to the flash，what type of bearings are produced? （）
When you turn on the fast time constant (differentiator) control of a radar it will（）.
Radar reflectors are required for（）.
Your ARPA has two guard zones.What is the purpose of the inner guard zone（）.
When will the float-free emergency position indicating radiobeacon be activated after abandoning ship? （）
When navigating in thick fog with the radar on，you should（）.
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（）.