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
最新試題
（）the canal transit，the radar was operating.
An electronic depth finder operates on the principle that（）.
The transmission time duration of a single pulse of radio-frequency energy is a function of the（）.
（）is on the panel of radar.
The microsecond unit of time is used in radar applications. The microsecond represents which of the following?（）.
The radar component that produces the synchronizing signal and triggers the indicator sweep is which of the following?（）.
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 tall object with a light on or near the shore，to act as a guide or warning to mariners is called（）.
（）should be used during the poor visibility if the radar’s screen shows heavy sea returns.
An ECDIS is required to display which information?（）