A.Straight line
B.Arc
C.Parabola
D.Hyperbola
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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
A.at all times
B.in the bottom return mode
C.in the volume reverberation mode
D.only when there is no current
最新試題
（）is on the panel of radar.
A Doppler log in the bottom return mode indicates the（）.
AREAS WHICH CANNOT BE SCANNED BY THE RADAR OF THE VESSEL BECAUSE THEY ARE SHIELDED BY PARTS OF ITS SUPERSTRUCTURE，MASTS，ETC means（）.
The transmission time duration of a single pulse of radio-frequency energy is a function of the（）.
The radar component that generates the radio-frequency energy in the form of short powerful pulses is which of the following?（）.
A tall object with a light on or near the shore，to act as a guide or warning to mariners is called（）.
What will NOT induce errors into a doppler sonar log?（）
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?（）.
An electronic depth finder operates on the principle that（）.
（）the canal transit，the radar was operating.