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 a radar in a unstabilized mode，fixes are determined most easily from（）.
（）typically extends from close as 0.1 nautical miles out to 32 NM.
PPI is（）.
Which statement concerning the operation of radar in fog is TRUE?（）
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（）.
What provides little or no indication that a vessel is dragging anchor? （）
（）is not used in modern radar.
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（）.
When hitting a solid object such as a ship or an airplane，the radar waves are reflected back （）they came.
Which ARPA data should you use in order to determine if a close quarters situation will develop with a target vessel? （）