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
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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
A.He space component
B.Control component
C.User component
D.Alarming component
最新試題
With respect to automatic identification systems（AIS），which information is required to be broadcast every 1 to 10 seconds（）.
Which one of the followings does not limit the effective range of radar（）.
Would you please（）on the radar?
Which of the following statements is TRUE regarding crane operations（）.
You are about to go to sea and adjust the magnetic compass．To expedite the adjustment at sea，in what order should the following dockside adjustments be made（）.
Which statement concerning GPS is TRUE（）.
Loran-C uses the multiple pulse system because（）.
The heading of a vessel is indicated by what part of the compass? （）
With respect to automatic identification systems（AIS），which information is expected to be broadcast every 1 to 10 seconds（）.
What does not contribute to the commercial GPS receiver position error（）.