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
Radar reflectors are required for（）.
（）typically extends from close as 0.1 nautical miles out to 32 NM.
What provides little or no indication that a vessel is dragging anchor? （）
When using an ARPA，what should you consider in order to evaluate the information displayed?（）
When will the float-free emergency position indicating radiobeacon be activated after abandoning ship? （）
When using the ARPA in heavy rain，which action should you take? （）
Which statement concerning the operation of radar in fog is TRUE?（）
When using the radar for navigating（）.
You are scanning the radar screen for a buoy fitted with racon. How should this signal appear on the PPI display?（）
（）is not a job of the radar antenna.