A.with
B.to
C.for
D.of
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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
（）is not used in modern radar.
Which ARPA data should you use in order to determine if a close quarters situation will develop with a target vessel? （）
You are underway at 5 knots and see on your radar a contact 10 miles directly astern of you. 12 minutes later，the contact is 8 miles directly astern of you. What is the estimated speed of the contact? （）
You are underway in restricted visibility and hear a fog signal forward of the beam. Nothing appears on your radar screen. You must（）.
（）is not a job of the radar antenna.
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 statement is true concerning a vessel equipped with operational radar?（）.
Which statement is TRUE concerning a vessel equipped with operational radar?（）.
The development of（）led to the fully automatic ARPA systems installed on commercial ships.
When you turn on the fast time constant (differentiator) control of a radar it will（）.