A.in dense fog
B.in boisterous weather
C.in the open sea
D.in rivers
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A.incorrect image
B.distinctive image
C.pictorial image
D.pictographic image
A.with
B.to
C.for
D.of
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
You are underway in restricted visibility and hear a fog signal forward of the beam. Nothing appears on your radar screen. You must（）.
（）typically extends from close as 0.1 nautical miles out to 32 NM.
When will the float-free emergency position indicating radiobeacon be activated after abandoning ship? （）
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（）.
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（）.
PPI is（）.
When you turn on the fast time constant (differentiator) control of a radar it will（）.
When using an ARPA，what should you consider in order to evaluate the information displayed?（）