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
A deadhead is a(n)（）.
The microsecond unit of time is used in radar applications. The microsecond represents which of the following?（）.
The minimum range at which a target can be detected is basically determined by which of the following?（）.
A radar display which is oriented，so that north is always at the top of the screen，is called a(n)（）.
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 canal transit，the radar was operating.
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 radar component that generates the radio-frequency energy in the form of short powerful pulses is which of the following?（）.