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)（）.
The number of pulses of energy transmitted per second is call the（）.
Compass error is equal to the（）.
What will NOT induce errors into a doppler sonar log?（）
A Doppler speed log indicates speed over ground（）.
（）is on the panel of radar.
The transmission time duration of a single pulse of radio-frequency energy is a function of the（）.
Deviation is the angle between the（）.
A deadhead is a(n)（）.
An ECDIS is required to display which information?（）