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
（）is on the panel of radar.
Deviation in a compass is caused by the（）.
A tall object with a light on or near the shore，to act as a guide or warning to mariners is called（）.
The radar component that produces the synchronizing signal and triggers the indicator sweep is which of the following?（）.
How is variation indicated on a small-scale nautical chart?（）.
Compass deviation is caused by（）.
A radar contact will remain stationary on a relative motion radar display only when it is（）.
Error may be introduced into a magnetic compass by（）.
The radar component that generates the radio-frequency energy in the form of short powerful pulses is which of the following?（）.
A radar display in which North is always at the top of the screen is a(n)（）.