A.radar transponder beacon
B.radar conspicuous beacon
C.radar calibration beacon
D.circular radiobeacon
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A.off／standby
B.standby／off
C.standby／close
D.close／standby
A.keeping a close watch and lookout
B.taking a radar range and bearing
C.observing a radar target and listening to signals
D.keeping a well clear caution
A.immediately when the contact is noted on radar
B.only if the radar scope is watched constantly
C.after the contact has been marked at least twice
D.by an occasional glance at the radar
A.the radar reflectors reflect better signals
B.fog horn signals travel farther to sea
C.it is equipped with strobe lights
D.it has a reduced watch circle
A.are tracked on reciprocal bearings
B.are tracked at the same range
C.are tracked on the same bearing
D.pass close together
最新試題
Your ARPA has two guard zones.What is the purpose of the inner guard zone（）.
What will cause the ARPA to emit a visual alarm，audible alarm，or both?（）
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 you turn on the fast time constant (differentiator) control of a radar it will（）.
You are underway in thick fog. You have not determined if risk of collision exists. Which statement is TRUE?（）.
When hitting a solid object such as a ship or an airplane，the radar waves are reflected back （）they came.
Although manual plotting for CPA works well，the workload can become overwhelming when confronted with（）.
When using a radar in a unstabilized mode，fixes are determined most easily from（）.
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? （）
The development of（）led to the fully automatic ARPA systems installed on commercial ships.