A.beam
B.radar
C.light beacon
D.reflector
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A.Straight line
B.Arc
C.Parabola
D.Hyperbola
A.relative display
B.composite display
C.stabilized display
D.unstabilized display
A.unstabilized display
B.stabilized display
C.composition display
D.relative display
A.on the same course as your vessel
B.at the same speed as your vessel
C.on the same course and speed as your vessel
D.on a reciprocal course at the same speed as your vessel
A.Separated line
B.Divided line
C.Reference line
D.Segregated line
最新試題
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?（）.
The microsecond unit of time is used in radar applications. The microsecond represents which of the following?（）.
The transmission time duration of a single pulse of radio-frequency energy is a function of the（）.
（）the canal transit，the radar was operating.
Compass deviation is caused by（）.
How is variation indicated on a small-scale nautical chart?（）.
A radar display which is oriented，so that north is always at the top of the screen，is called a(n)（）.
AREAS WHICH CANNOT BE SCANNED BY THE RADAR OF THE VESSEL BECAUSE THEY ARE SHIELDED BY PARTS OF ITS SUPERSTRUCTURE，MASTS，ETC means（）.
Gyrocompass repeaters reproduce the indications of the master gyrocompass. They are（）.
What will NOT induce errors into a doppler sonar log?（）