A.Bell alarm to warn the user
B.Lighted alarm signal to warn the user
C.Alternate signal keying system
D.View finder for each station
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A.Less signal energy is necessary for receiver operation
B.More signal energy is available at the receiver
C.It significantly increases the peak power
D.It increases the signal capacity
A.Reflected electron
B.Electrical radiation
C.Quarterpoint electrical navigation
D.Hyperbolic radio navigation
A.only accurate during daylight hours
B.much less accurate
C.only accurate at twilight
D.more accurate than using ground waves
A.Skip zone
B.Blackout zone
C.Diffraction zone
D.Shadow zone
A.provide safety-related information automatically to shore stations，other vessels and aircraft
B.receive safety-related information automatically from similarly equipped vessels
C.exchange safety-related information with shore-based facilities
D.All of the above
最新試題
Radar makes the most accurate determination of the（）.
Which statement concerning GPS is TRUE（）.
The operation of which aids to navigation may be suspended during war or national emergency（）.
The correction to be applied to a Loran-C reading when matching a sky wave to a ground wave may be found（）.
（）is not a component of GPS.
（）is not an alarm required by IMO standards to be available on the ECDIS.
The operator of the ship’s radiotelephone，if the radiotelephone is carried voluntarily，must hold at least a（）.
Which of the following statements is TRUE regarding crane operations（）.
Would you mind（）your DF?
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.