A.radio signals reflect from a solid surface
B.sound waves travel at a constant speed through water
C.radar signals travel at a constant speed through water
D.pressure increases with depth
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A.Water temperature
B.Climatology data
C.Speed of advance
D.Depth contours
A.Soundings
B.Waypoints
C.Meteorological data
D.Radar targets
A.Radar targets
B.ARPA vectors
C.Hydrographic data
D.All of the above
A.beam
B.radar
C.light beacon
D.reflector
A.Straight line
B.Arc
C.Parabola
D.Hyperbola
最新試題
A Doppler speed log indicates speed over ground（）.
A barometer showing falling pressure indicates the approach of a（）.
A FICTIVE LINE DISPLAYED ON THE RADAR SCREEN SEPARATING THE FAIRWAY FOR INBOUND AND OUTBOUND VESSELS SO THAT THEY CAN SAFELY PASS EACH OTHER defines（）.
（）should be used during the poor visibility if the radar’s screen shows heavy sea returns.
The number of pulses of energy transmitted per second is call the（）.
The radar component that generates the radio-frequency energy in the form of short powerful pulses is which of the following?（）.
The radar component that produces the synchronizing signal and triggers the indicator sweep is which of the following?（）.
Gyrocompass repeaters reproduce the indications of the master gyrocompass. They are（）.
A Doppler log in the bottom return mode indicates the（）.
Compass error is equal to the（）.