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
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The number of pulses of energy transmitted per second is call the（）.
Deviation is the angle between the（）.
A deadhead is a(n)（）.
A radar contact will remain stationary on a relative motion radar display only when it is（）.
The transmission time duration of a single pulse of radio-frequency energy is a function of the（）.
A Doppler log in the volume reverberation mode indicates（）.
Error may be introduced into a magnetic compass by（）.
An electronic depth finder operates on the principle that（）.
A Doppler log in the bottom return mode indicates the（）.
A radar range to a small，charted object such as a light will provide a line of position in which form?（）.