A.Focus line
B.Base line
C.Side line
D.Center line
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A.DCU
B.UTC
C.ENC
D.MENU
A.AIS
B.ECDIS
C.GPS
D.VDR
A.direction of a target
B.distance to a target
C.size of a target
D.shape of a target
A.Bell alarm to warn the user
B.Lighted alarm signal to warn the user
C.Alternate signal keying system
D.View finder for each station
A.Less signal energy is necessary for receiver operation
B.More signal energy is available at the receiver
C.It significantly increases the peak power
D.It increases the signal capacity
最新試題
Which one of the followings does not limit the effective range of radar（）.
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.
Most modern Loran-C receivers，when not tracking properly，have a（n）（）.
With respect to automatic identification systems（AIS），which information is expected to be broadcast every 1 to 10 seconds（）.
The loran lines drawn on navigation charts represent（）.
The heading of a vessel is indicated by what part of the compass? （）
With respect to automatic identification systems（AIS），which information is required to be broadcast every 1 to 10 seconds（）.
The（）transmits own ship data cyclically via two defined VHF channels and receives the same data of the other ships and objects that are equipped with AIS systems.
When navigating using DGPS（Differential Global Positioning System）you may expect your position to be accurate to within a radius of（）.
Loran-C uses the multiple pulse system because（）.