A.should not be made
B.are not to be taken
C.should be taken
D.shall be made
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A.used
B.available
C.in use
D.can be used
A.unwanted interference
B.unexpected figures
C.abnormal data
D.unwanted information
最新試題
When using the ARPA in heavy rain，which action should you take? （）
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（）.
When hitting a solid object such as a ship or an airplane，the radar waves are reflected back （）they came.
Which procedure(s) shall be used to determine risk of collision? （）
What will cause the ARPA to emit a visual alarm，audible alarm，or both?（）
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.
（）is not used in modern 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（）.
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（）.