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 transmission time duration of a single pulse of radio-frequency energy is a function of the（）.
How is variation indicated on a small-scale nautical chart?（）.
A barometer showing falling pressure indicates the approach of a（）.
The radar component that generates the radio-frequency energy in the form of short powerful pulses 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 radar display in which North is always at the top of the screen is a(n)（）.
What will NOT induce errors into a doppler sonar log?（）
Deviation in a compass is caused by the（）.
The number of pulses of energy transmitted per second is call the（）.
A radar display which is oriented，so that north is always at the top of the screen，is called a(n)（）.