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
While you are at anchor，what will serve as a positive warning that you are drifting towards the wrecks located to the NW and SW of your 2215 position（）.
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.
Most modern Loran-C receivers，when not tracking properly，have a（n）（）.
Loran-C uses the multiple pulse system because（）.
The correction to be applied to a Loran-C reading when matching a sky wave to a ground wave may be found（）.
The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with（）.
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（）.
The loran lines drawn on navigation charts represent（）.
（）is a digitized“picture”of a chart.
Which one of the followings does not limit the effective range of radar（）.