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
Which ARPA data should you use in order to determine if a close quarters situation will develop with a target vessel? （）
When using the ARPA in heavy rain，which action should you take? （）
You are scanning the radar screen for a buoy fitted with racon. How should this signal appear on the PPI display?（）
When using a radar in a unstabilized mode，fixes are determined most easily from（）.
PPI is（）.
Your ARPA has two guard zones.What is the purpose of the inner guard zone（）.
When using the radar for navigating（）.
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.
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（）.
Your ARPA has automatic speed inputs from the log．Due to currents，the log is indicating a faster speed than the speed over the ground.What should you expect under these circumstances（）.