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
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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
A.speed being made good
B.speed through the water
C.the set of the current
D.the depth of the water
A.velocity of the current
B.bottom characteristics
C.depth of the water
D.speed over the ground
A.tree or log awash in a nearly vertical position
B.crew member who refuses to work
C.upstream end of a land wall
D.buoy that is adrift
最新試題
A radar display which is oriented，so that north is always at the top of the screen，is called a(n)（）.
What will NOT induce errors into a doppler sonar log?（）
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（）.
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?（）.
A radar range to a small，charted object such as a light will provide a line of position in which form?（）.
An ECDIS is required to display which information?（）
The microsecond unit of time is used in radar applications. The microsecond represents 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（）.
（）the canal transit，the radar was operating.