A.Separated line
B.Divided line
C.Reference line
D.Segregated line
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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
A.high pressure system
B.low pressure system
C.high dew point
D.low dew point
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（）the canal transit，the radar was operating.
A FICTIVE LINE DISPLAYED ON THE RADAR SCREEN SEPARATING THE FAIRWAY FOR INBOUND AND OUTBOUND VESSELS SO THAT THEY CAN SAFELY PASS EACH OTHER defines（）.
An ECDIS is required to display which information?（）
A radar range to a small，charted object such as a light will provide a line of position in which form?（）.
A deadhead is a(n)（）.
The radar component that produces the synchronizing signal and triggers the indicator sweep is which of the following?（）.
Deviation is the angle between the（）.
The transmission time duration of a single pulse of radio-frequency energy is a function of the（）.
A tall object with a light on or near the shore，to act as a guide or warning to mariners is called（）.
（）is on the panel of radar.