A.used
B.available
C.in use
D.can be used
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A.unwanted interference
B.unexpected figures
C.abnormal data
D.unwanted information
最新試題
Your ARPA has two guard zones.What is the purpose of the inner guard zone（）.
Radar reflectors are required for（）.
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 underway at 5 knots and see on your radar a contact 10 miles directly astern of you. 12 minutes later，the contact is 8 miles directly astern of you. What is the estimated speed of the contact? （）
You are underway in thick fog. You have not determined if risk of collision exists. Which statement is TRUE?（）.
（）is not a job of the radar antenna.
When navigating in thick fog with the radar on，you should（）.
（）typically extends from close as 0.1 nautical miles out to 32 NM.
Which statement concerning the operation of radar in fog is TRUE?（）