A.with
B.to
C.for
D.of
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A.should not be made
B.are not to be taken
C.should be taken
D.shall be made
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
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.
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? （）
What provides little or no indication that a vessel is dragging anchor? （）
You are underway in restricted visibility and hear a fog signal forward of the beam. Nothing appears on your radar screen. You must（）.
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（）.
Which condition indicates that your radar needs maintenance?（）
Which statement is TRUE concerning a vessel equipped with operational radar?（）.
When will the float-free emergency position indicating radiobeacon be activated after abandoning ship? （）
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.