A.direction of a target
B.distance to a target
C.size of a target
D.shape of a target
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A.brightness of objects
B.color of targets
C.shape of targets
D.bearing of objects
A.Latitude
B.Longitude
C.Speed
D.Time
A.deviation
B.variation
C.local attraction
D.All of the above
A.at close range
B.at end on situation
C.at head on situation
D.at crossing situation
A.to get
B.to approach
C.to proceed
D.to close
最新試題
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.
Would you mind（）your DF?
Automatic identification systems（AIS）are required to（）.
When your vessel is proceeding to the area of traffic density，（）is used to determine the exact ranges of other ships or objects in the vicinity.
If the radio signal ground wave extends out for less distance than the minimum skywave distance，there is an area in which no signal is received．This is called the（）.
Loran-C uses the multiple pulse system because（）.
In using Loran-C，skywave reception gives greater range but is（）.
The operator of the ship’s radiotelephone，if the radiotelephone is carried voluntarily，must hold at least a（）.
When navigating using DGPS（Differential Global Positioning System）you may expect your position to be accurate to within a radius of（）.
The operation of which aids to navigation may be suspended during war or national emergency（）.