A.Water temperature
B.Climatology data
C.Speed of advance
D.Depth contours
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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
A.relative display
B.composite display
C.stabilized display
D.unstabilized display
最新試題
The transmission time duration of a single pulse of radio-frequency energy is a function of the（）.
Deviation is the angle between the（）.
The microsecond unit of time is used in radar applications. The microsecond represents which of the following?（）.
The number of pulses of energy transmitted per second is call the（）.
Compass error is equal to the（）.
The radar component that generates the radio-frequency energy in the form of short powerful pulses is which of the following?（）.
Compass deviation is caused by（）.
（）20 targets can be tracked at one time．When maximum tracking capacity is reached，no further acquisitions are possible.
Error may be introduced into a magnetic compass by（）.
An indirect radar echo is caused by a reflection of the main lobe of the radar beam off the observer’s vessel. Which of the following is NOT a characteristic of indirect echoes?（）.