A.at all times
B.in the bottom return mode
C.in the volume reverberation mode
D.only when there is no current
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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
A.At
B.In
C.During
D.With
最新試題
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?（）.
The minimum range at which a target can be detected is basically determined by which of the following?（）.
An ECDIS is required to display which information?（）
You are using a radar in which your own ship is shown at the center，and the heading flash always points to 0°. If bearings are measured in relation to the flash，what type of bearings are produced?（）.
The number of pulses of energy transmitted per second is call the（）.
Compass deviation is caused by（）.
A Doppler log in the volume reverberation mode indicates（）.
Deviation in a compass is caused by the（）.
The radar component that produces the synchronizing signal and triggers the indicator sweep is which of the following?（）.
（）the canal transit，the radar was operating.