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
Which statement about an estimated position is TRUE?（）
PPI is（）.
Which statement is true concerning a vessel equipped with operational radar?（）.
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? （）
When hitting a solid object such as a ship or an airplane，the radar waves are reflected back （）they came.
（）is not used in modern radar.
Which general statement concerning radar is FALSE?（）.
You are underway in thick fog. You have not determined if risk of collision exists. Which statement is TRUE?（）.
When using the radar for navigating（）.
Which procedure(s) shall be used to determine risk of collision? （）