A.incorrect image
B.distinctive image
C.pictorial image
D.pictographic image
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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
The development of（）led to the fully automatic ARPA systems installed on commercial ships.
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（）.
Which condition indicates that your radar needs maintenance?（）
When using the radar for navigating（）.
Which statement is TRUE concerning a vessel equipped with operational radar?（）.
You are scanning the radar screen for a buoy fitted with racon. How should this signal appear on the PPI display?（）
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 two guard zones.What is the purpose of the inner guard zone（）.
When you turn on the fast time constant (differentiator) control of a radar it will（）.
Which statement about an estimated position is TRUE?（）